D.I.D is the number one motorcycle chain in the world. D.I.D chains are used by factory races teams from all manufacturers in race series everywhere. The All New D.I.D 520DZ2 is the best value in a lightweight, high-performance chain designed for motocross racing. Great value in a lightweight chain. Designed for off-road riding and motocross. The DZ2 has twice the lifespan of the previous DZ. SDH pin treatment - hard chromium-carbide layer formed on pin surface for exceptional strength and wear resistance. Flexible inner soft core absorbs shock. For entry level motocross, trial riding at an affordable price. Average tensile strength of 7,870 pounds. Wear life index: 410. Rated for up to a 450cc motocross bike. Weight (per 100 links): 3.08 pounds. Includes a clip-style master link. Gold finish, 120 links. Notes: DZ and DZ2 Connecting Links are not interchangeable. Non-sealed chains require more regular maintenance than sealed (O-ring, X-ring) versions and are mainly recommended for off-road use. D.I.Ds exclusive SDH (Super DH) pin treatment is the secret behind the superior performance of the DZ Series chains. This high-tech pin treatment forms an extremely hard chromium carbide layer on the pins surface while maintaining a soft inner core. SDH treated pins have extreme impact strength while maintaining outstanding shock absorption. This treatment creates a chain with anti-oxidation properties and superior wear resistance against invasion of hard foreign materials.