GOOFIT Cylinder Kit for 4 Stroke GY6 49cc 50cc ATV Scooter 39mm Bore 39mm bore cylinder piston kit Fit for GY6 4 stroke 50cc 139qmb engine(read description for detailed fitment infos) Package including: cylinder head,piston, piston ring,gaskets,clips,piston stud Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)