Sunstar Front Sprocket Manufactured from case-hardened chromoly steel for the ultimate in strength and durability. "Parkerizing" surface treatment for rust and corrosion resistance. Sunstar Steel Rear Sprocket Manufactured using only the highest quality 1045 high-carbon steel. Exclusive heat treatment for added strength and wear resistance. Most are zinc plated and have a baked-on durable paint process for corrosion resistance. The strongest, longest lasting steel replacement sprocket available. Sunstar HDN Heavy Duty Non-Sealed Chain This non-sealed, cost effective OEM replacement Heavy Duty chain offers zero compromise in performance and/or reliability. Great choice for any off road motorcycle up to 250cc. Durable and strong with a tensile strength rating of 7,850 lbs.