The MotoSport.com Vortex Chain Sprocket Kit 520 - Black includes ONE Steel Countershaft (Front) Sprocket, ONE Aluminum Rear Sprocket, and your choice of ONE Premium 520 Drive Chain, each with the following features: Sprockets / Chainwheels Included: For more than 15 years, U.S.-based Vortex Racing continues to manufacture, market and sell top-quality motorcycle racing components for Motocross, Supercross, Road Racing, Flat Track Racing and Minibikes. Owned and operated by motorcycle racers and enthusiasts, they focus on absolute quality. Each of their race components is made to the tightest tolerances with the best quality materials in the industry. Vortex tests on the track with direct feedback from top professional race teams worldwide. Vortex parts have been put to the test by some of the worlds most respected champions and teams. Vortex Front Steel Sprocket 520: Made of the highest quality steel. Case hardened. Drilled lightening holes on most applications. Vortex Rear Aluminum Sprocket 520 - Black: 100% CNC machined with saber tooth grooves. Vortex patent pending design. Available in a variety of colors or PTFE black hardcoat, which bonds to the aluminum to create a more durable surface with less friction. 7075 T6 billet aluminum, lightweight for less rotating mass. Improved acceleration, deceleration and directional changes. Your Choice of Drive Chain: D.I.D 520 ZVMX Series X-Ring Gold Chain - 120 Links: D.I.Ds engineers are continuously improving chain designs in order to handle the tremendous horsepower loads of todays high performance motorcycles. In developing the new DID ZVM-X series, D.I.D focused on "Rigidity." Traditionally, "Tensile Strength" has been the bench-mark to indicate overall strength, but tensile strength is only a laboratory static measurement of a chains fracture point. Rigidity, on the other hand, is the ability of a chain to withstand the forces that occur in the real world that riders experience. Increased rigidity means better power transfer from the engine to the ground, greater resistance to stretching under load, and overall improved performance that meets the demands of the current high-power bikes and the people who ride them. Increased rigidity for better power transfer and greater resistance to stretching under load. Overall improved performance that meet the demands of the current high-power bikes. Designed to meet requirements of machines bigger than 1000cc. Same excellent characteristics of the ZVM chains, but its new X2-ring design provides 40 percent greater wear resistance and better overall chain life. Average tensile strength of 8,745 pounds. Wear life index: 3500. For use on Superbikes; maximum rated displacement 1200cc. Weight (per 100 links): 3.59 pounds. Includes a rivet-style master link. 120 links. RK 520 GBXSO X-Ring Gold Race Chain - 120 Links: As part of their continuing quality improvement program, the RK Chain Factory has made a running production upgrade to their best selling 520XSO chain. The new upgrade GBXSO and non-gold XSO chains features RKs proprietary "RX-Ring" seal design and is offered in 520, 525 and 530 versions. Viewed in cross-section, the RK "RX-Ring" has two lubrication pools and seal points versus the single seal point / pool design of a regular O-ring chain. RKs new GBXSO chains offer quality, performance and unbeatable value, for all but the most demanding high performance applications. High-performing, durable chain that will last five to eight times longer than your standard motorcycle chain. Constructed from polished, shot-peened alloy steel providing high tensile strength for maximum performance. RK RX-ring seals are made from an advanced Nitrile Butadiene composite for maximum performance and wear life. Side plate treatment helps prevent corrosion. Designed to make any motorcycle look stylish. Average tensile strength of 8,500 pounds. Wear life index: 750. Maximum displacement (street / dirt): 750cc / 750cc. Weight (per 100 links): 3.36 pounds. Includes a rivet-style master link. 120 links. RK 520 GBGXW Series Gold Chain - 120 or 140 Links: GB520GXW is RKs premium quality 520 XW-Ring chain. XW-Ring chains are the best high-speed, extreme heat performance chains available today. So, If youve modified your ride into an extreme high-speed machine, you need the strength and performance of GBGXW. With a maximum tensile strength rated at 8800 foot pounds and suitable up to 1000cc street bikes and 750cc off-road bikes, GBGXW can handle anything you dish out! Strong chain with great durability for aggressive motorcycle riding and racing. Uses an advanced design with XW-Ring construction for better sealing that provides extended wear and chain life up to 100% over conventional chains. Constructed from polished, shot-peened alloy steel providing high tensile strength for maximum performance. Side plate treatment helps prevent corrosion. Designed to make any motorcycle look stylish. Average tensile strength of 8,800 pounds. Wear life index: 1000. Maximum displacement (street / dirt): 1000cc / 750cc. Weight (per 100 links): 3.75 pounds. Includes a rivet-style master link. 120 or 140 links. Sunstar 520 Road DualGuard Sealed Chain - 120 Links: Sunstars heavy duty, street motorcycle chain model is the RDG series (RDG = Road Dual Guard) for 520, 525 and 530 applications. It uses Sunstars DualGuard sealed ring street bike chain technology where the sealing ring has an X shape - meaning there are two sealing points and two lubrication pools versus the one-sided, single-lip design of a standard O-ring. This sealed ring design type dramatically improves lubricity in high heat conditions while providing lower friction and longer chain life - and it is available for just about every street motorcycle on todays market. It comes in the natural color option and uses a strong rivet-type connecting link. For a higher performance road chain at a non-premium price, the Sunstar RDG answers the bell and is great for everything from everyday commuting to closed course riding. Features Sunstars DG-ring (DualGuard) design for better performance and durability. Great choice for any type of street use; perfect choice for high-performance riding but at a non-premium price. Only available in a Natural finish. Average tensile strength of 8,500 pounds. Maximum rated displacement (street / off-road): 750cc / 750cc. Weight (per 100 links): 3.36 pounds. Includes rivet-style master link. 120 links. Sunstar 520 RTG1 Works TripleGuard Sealed Racing Chain - 120 Links: For a top of the line, premium-level road racing chain, Sunstar offers the RTG1 series - Sunstars highest performing road racing chain - for 520 and 530 street applications (RTG1 = Road Triple Guard). This Works level chain features the TripleGuard sealed ring technology where there are 3 sealing lips and lubrication pools on each side of the ring to maintain top performance in high heat, extreme conditions; the TripleGuard ring type is the best for lubrication and protection. Both the 520 and 530 are available in pre-cut lengths and come in the gold color option (gold outer and inner plates). While the 520 is great for any bike 1000cc or less which already uses a 520 pitch, the 530RTG1 is suitable for the high-performance, larger displacement machines like the Suzuki Hayabusa, Kawasaki ZX-14R Ninja and others in the same class that use 530 pitch. Both options use the rivet-type connecting link and are well suited to handle the demands of the toughest racing conditions encountered on the street. Utilizes exclusive TG-ring (TripleGuard) for the ultimate in heat prevention and lubricity even in extremely harsh conditions. Assembled of the best 100% heat treated components. Extremely strong, yet also in a lightweight design - weighing just over 4 pounds per 100 links. Only available in Gold finish. Average tensile strength of 8,760 pounds. Maximum rated displacement (street / off-road): 1000cc / 750cc. Weight (per 100 links): 4.30 pounds. Includes rivet-style master link. 120 links. Note: Image is for reference ONLY, actual product will vary based on fitment and selection.