100 Pack Black 40mm Rear Wheels for Shell Style Co2 Dragsters100 Pack black rear wheels with an open axle hole for shell style Co2 dragster cars Each wheel is made of durable polypropylene, constructed in one piece, and features an axle hole that fits a 1 8" diameter axle (axle not included). Note: The axle hole goes all the way through perfect for a shell style dragster where the axle is hidden under the body. 40mm diameter with a surface contact width of approx. 17. 5mm Each wheel weighs approx. 0. 18 ounce