This Schwinn Stingray Bmx Single Speed Coaster Chain is a 1/2 X 1/8 inch seamless chain. This chain is a great choice for any bike because it is reliable and specifications are consistent. The chain is made from polished and lubricated materials which eliminates the need for any grease or oil. It also has a black finish which gives it a high-quality look. The chain is easy to adjust and is made to last.