Features quad pin riveting, solid bushings and rollers, and tough O-ring seals Shot-peened and pre-stretched Recommended for motorcycles originally equipped with O-ring chains Provides 1-1/2 times longer wear life than an O-ring chain and 12 times longer wear life than a standard chain 520 chain includes clip connecting link 525/530 chain includes rivet connecting link Made in Japan. CHAIN PU 525 O-RING X 25F