We strongly recommend the X-Ring for most purposes:- Here is some info towards help you selecting your chain:- 

Compared with Normal O-Ring, X Ring has:- 

• Half the Power Loss  
• 1.5 to 2 Times Longer Wear Resistance

D.I.D’s PATENTED X-Ring construction reduces friction by twisting between the side plates instead of being squashed. Normal O-Rings and other makers’ modified O-Rings have squashed points that increase friction. The twisting action of the X-Ring disperses the pressure and minimizes power loss. X-Ring is a U.S.A. Registered Trademark of D.I.D; Daido Kogyo Co. Ltd. Japan

The X-Ring’s four contact points greatly increase its sealing performance. This keeps the dirt out and the lubrication in much better than any other O-Ring. X-Rings have the greatest wear resistance of any other type of O-Ring or Non-O-Ring chain.

• 520VX2	750cc	Great Value X-RING
  525VX	900cc	Great Value X-RING
  530VX	1000cc	Great Value X-RING

   

• DID 525ZVM-X*112 FB
• Master Link - Rivet Type Rivet :- DID 525VX ZJ

Brand - DID Chains, Japan

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BEST BEFORE: 10 YEARS FROM DATE OF IMPORT