【Premium Rubber】Bumper plates are constructed of high density solid rubber, withstand repeated drops and with minimal bounce, protect weight plates and floor from any damage, meanwhile also for noise reduction. 【Olympic Bumper Plates】Olympic plates has stainless-steel inner ring, tough and long-lasting, to allow maximum stacking on an Olympic barbell. The increased load capacity helps continuously build strength and increase muscle mass. Bumper weight plates have 2 inch/50 mm hole, fits any olympic barbell or dumbbell bar with a 2" diameter 【Color Coded】 Olympic weight plates are color coded by size for easy identification, non fading and non discoloration. Rubber weight plates is evenly distributed, weight meets to -1.5% to +1.5% tolerance. Each plate has the same diameter of 450mm for easy loading and unloading. 【Versatile Use】Bumper plates are perfect to perform weightlifting, strength training such as deadlifts, bench presses, squats, curls. IMPORTANT - 5kg plates are not designed to be used alone - please use together with other size weight plates. 【Single or Pair】 PROIRON bumper plates are sold in single or pair, including Grey 5kg (pair), Green 10kg (pair), Yellow 15kg (single), Blue 20kg (single), Red 25kg (single). Our plates must be one of your best choices.