The Simson Chain Derailleur 10 speed is a high quality bike chain with an environmentally friendly anti-rust coating for bikes with 10 (UG) derailleurs. This chain has 116 links and a size of 1/2"x 5/64". The chain can be customized using a Simson chain tool. Put the chain on the sprockets and close the ends of the chain together by snapping in the included connecting link.