Set of 6 nuts for rear sprocket. Reducing unsprung mass at the wheel is a very effective way to improve the handling and performance of a race bike. These Titanium 6AL-4V (grade 5) sprocket nuts are highly corrosion resistant and extremely light weight (50% lighter than large OEM steel nuts). This is a set of 6 nuts for the rear sprocket of the Yamaha R3. These are a must have for any racer or anyone who wants to replace rusty original nuts with higher quality, lightweight titanium nuts.