Regina's latest evolution in O-ring chain seals in the lubricant and keeps out dirt better than ever Smaller, thinner O-rings improve sealing Rated for street use to 600cc Average tensile strength of 7870 lbs. 4. 3 lbs. per 100 links Clip and rivet links included with each chain 530 ORS2 has eye catching gold colored outer plates Features - high carbon alloy pins, seamless rollers and bushings, shot peened plates and rollers, pre-stretched at the factory