ITEM NAME:GY6-125 Beyond Bicycle 150cc Integral Starter Disc Overrunning Clutch Assembly y Descriptio n Description: 100% Brand new starter clutch Diameter: Approx. 107mm/4.21" Starter Drive Clutch Assembly for GY6 125cc 150cc Engine High quality steel material, efficient and durable. Easy to install, no Installation Instruction. Specification: Material: Metal Package Includes: 1 Piece Starter Clutch Assembly Honesty is gold for all! GY6-125 Beyond Bicycle 150cc Integral Starter Disc Overrunning Clutch Assembly