New, high-performance ZR chains with new patented Z44 seal Z-ring sections. Z-ring flexes when assembled, creating a spring effect that guarantees seal will not diminish over time. Z-ring section also provides enhanced chain flexibility. Features high alloy steel plates and pins, solid bushings and rollers and. shot-peened plates, pins and rollers. Pre-stretched to enhance performance. Clip type and rivet type links included.