Brand New Race-Driven O-Ring Chain. You will receive 1 - 520-94L O-Ring Chain. All chains include a masterlink. These chains are designed for the casual - recreational rider. Race-Driven branded o-ring chain has an average tensile strength in excess of 8200 lbs. Make sure when purchasing a chain you do so according to your riding style. O-Ring chain is named such because it has rubber o-rings between each link so it helps hold the oil in the in and the dirt out. The o-rings helps keep the pins lubricated which reduces friction and helps the chain last longer. Race-Driven is committed to bringing the highest quality products to all riders at an affordable price. Customer Driven – Quality Driven – Race-Driven.