MSR Steel Rear Sprocket - 47T - YZ47

The optimum combination of strength, weight and durability
Rear sprockets made from ultra-hard, heat-treated cro-moly steel, no more than 4oz. heavier than aluminum
Front and rear sprockets guaranteed for 1 year against wear (product registration required)
Replace O.E. hardware with ultra-tough Grade 10 Sprockets Bolts
Used and endorsed by Malcolm Smith