Renthal UL FRT Sprocket 520-16T for Kawasaki ZX 7R 10R Suzuki GSXR Renthal Off Road Sprockets are simply the finest front chainwheel on the market today. They are available in Standard and Ultralight. Specifically developed Nickel-Chrome-Molybdenum steel, case hardened and core refined to give the ultimate combination of strength and hardness Ultralight model design reduces unnecessary weight while retaining maximum strength Precision CNC machining, resulting in extremely close tolerances