You can also email us your sprocket tooth count information before / after check-out IF YOU DO NOT GIVE US THE SPROCKET TOOTH COUNT WITH YOUR PAYMENT, OR IN A SEPARATE EMAIL YOUR ORDER WILL BE DELAYED WHILE WE CONTACT YOU. For example: if you want a 40 tooth sprocket write: "40 TOOTH" in the notes to seller section of your PayPal payment. When paying write the SPROCKET TOOTH COUNT you want us to ship in your PayPal payment notes. Made with the highest quality aluminum7075 T6 aluminum is the best grade material for light weight and durabilityThe weight you save on drive components is multiplied as rotating massLess rotating weight improves accelerationCNC Machined to tightest tolerancesTheir unique manufacturing process creates a perfectly concentric sprocket every timeThis frees horsepower and extends the life of both the chain and sprocketPerfected tooth design has less drag and reduces friction for better acceleration and decelerationAttractive, Smart DesignVortex patented design offers a unique lookMud grooves and coating help keep components cleanAll sprockets available in single tooth incrementsORDERING INSTRUCTIONS: Refer to the sprocket tooth counts available above. They considerably reduce mass and allow you to change your gearing. You can also email us your sprocket tooth count information before / after check-out via eBay messagesProduct Features:Vortex sprockets are a lightweight high-performance alternative to the stock steel sprocket. When paying please write the SPROCKET TOOTH COUNT you want us to ship in your PayPal payment notes. imgVORTEX RACING SILVER REAR ALUMINUM SPROCKETAvailable in 40-57 Tooth - 428 Chain Pitch2002-2016 Yamaha YZ85 This listing is for 1 Vortex Rear Sprocket.