IVANKO (COT-2.5) Compression Ring Olympic Training Collars, Chrome (PAIR) IVANKO's original compression-ring technology (EASY-ON/EASY-OFF). FOR OLYMPIC BAR SLEEVES (50mm). NOT FOR regular 1" or 1-1/16" Machined Steel Body. Chrome-plated finish. Weight: 5 lbs. per pair (2.5 lbs each). Thickness: 1-3/8"