Transmission Gear Reduction Box—This is 11 tooth T8F double chain 47cc 49cc motor clutch drum gearbox,allows higher speeds out of your small engine, and smoother acceleration. Fitment—The Transmission Control Plate is built to meet standard specification, strictly follow factory quality control,especially fits for 2 Stroke Chinese Minimoto Baby Kid Dirt Bike. Perfect Replacement—Original standard, direct replacement for the old or broken one.Simple to install, no modification needed, Excellent Performence—The Clutch Drum Gear Box is made of quality aluminum alloy, firm, anitrust and corrosion resistant for long time use.Precision manufacturing makes it has stable performance.