SUNSTAR 5-130840 Works Triplestar 40T Aluminum Rear Sprocket 520 PitchSUNSTAR 5 130840 Works Triplestar 40T Aluminum Rear Sprocket 520 Pitch This is a brand new, high performance SUNSTAR 5 130840 Works Triplestar aluminum rear sprocket with 40 teeth, designed for lightweight durability and superior power transfer on off road and motocross bikes. Key Product Features Aerospace Grade Construction: Made from the highest quality 7075 T 6 aluminum, which is an aerospace grade material known for its high strength to weight