DID 525ZVM-X2 / 530ZVM-X2 Connecting Link. D.I.D's ZVM-X Series utilizes their patented X-Ring seal and the twisting action of the X-Ring® increases its sealing performance and its four contact points minimizes power loss. The ZVM-X Series’ Direct Energy Transfer, born from their experience in MotoGP, means greater stretch resistance under load. Rivet styled link. Sold individually. Note: Does NOT fit ZVM-X chains - ZVM-X2 models ONLY.