Drivetrain kit comprised the front (14T) and the rear (52T) sprocket and the chain. Fits for 450 EXC '08-'14. 350 EXC-F '12-'14, 250 EXC-F, 450 XC-W '14 and 450-505 XC-F '08-'09, 530 XCR-W '08-'09. Will fit other models, please look into FicheFinder.