JT Sprockets 520 Steel Front Sprocket Yamaha R6 / R7 / Yzf750R JT Sprockets utilizes the latest in computer design and metal cutting technology to ensure maximum durability. Its state-of-the-art manufacturing process enhances the longevity and performance of the sprockets, making it a reliable choice for motorcycle enthusiasts. Features: 520 conversion for models listed JT front sprockets are made from ultra durable Scm420 steel alloy All sprockets are heat-treated and hand-finished to meet or exceed the highest quality standards