SUPERSPROX Steel Rear Sprocket 39-Tooth RFE-1350-39-BLK

Gives you longer system life without compromising weight, Steel teeth last 4 times longer than aluminum, Pound-for-pound, the strongest sprocket on the market, The aluminum core is 70% lighter than steel, Forging rivets into the sprockets provide exceptional strength, Designed for bikes up to 1400cc in displacement, Steel teeth last 4 times longer than aluminum, Great for street, MX, off-road and ATV applications of all sizes