IVANKO (COC-2.5KG) Compression Ring Olympic Collars, Chrome Finish (PAIR) Compression-Ring Olympic Collar for Competition. Easy-on/Easy-off. ORIGINAL IVANKO DESIGN! -- Beware of imitations Knurled spin-lock feature insures plates fit snug together. 5 kg per pair (i.e. each collar weighs 2.5kg) Fully machined on all surfaces. Chrome-plated finish.