GOOFIT 25H 138 Chain for 2 Stroke 47cc 49cc Pocket Bike Mini Bike Dirt Pit Bike ATV Quad 25H 138 Links Chain Fits for 2-stroke 47cc 49cc Pocket Bike Mini Bike size 25H 138 link Length (folded in half): 17" Total Links: 69 Inner link (per link): 5.23mm; Outer link (per link):7.5mm; Length (per link): 11.3mm. 90 days warranty Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon)