GOOFIT Small 6 Teeth Gearbox Clutch Drum for 2 Stroke 47cc 49cc Pocket Bike The item uses the 25H chain The segment spacing:6.3mm 6-Teeth(Small) Gearbox Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)