Tensile strength. ProTaper 520 Pro Series Forged Slim O-Ring Chain. Manufacturer: ProTaper. Model: 520 Pro Series Forged Slim O-Ring Chain. They may opt to repair or replace the item at their discretion.
This chain is awesome. It's a slim O-ring and it's 2mm narrower than your typical O-ring chain. Very Quiet. I run it on 3 bikes, all that have over 50hp and this thing does not stretch one iota. And the gold color looks factory.