D.I.D TRACK CHAINS BACK IN STOCK NJS November 3, 2023November 3, 2023 Thomas Beautiful top level chain from D.I.D Japan. Track specific and NJS certified and stamped for professional Keirin track use with screw type master link (included) and hardened pins. All silver finish with 116 links. The D.I.D Track Chain (black) offers D.I.D quality at a lower price than the Pro with a choice of black or silver finish.D.I.D produce high quality, reliable chains made in Japan. The track bike chain features an all nickel silver finish with 116 links. It also includes traditional spring type master link.