Each of these color bumpers is an standard 450MM in diameter, with a narrow plate width that allows for more weight to be loaded on the bar. A 50.4MM collar opening and steel disc insert keep the plates firmly in place even during intense, high-rep training. The color coding of the KG Training Plates makes them easy to identify at a glance, helping athletes, trainers, and coaches run more efficient workouts. Red = 25KG, Blue = 20KG, Yellow = 15KG, and Green = 10KG. STEEL CORE  – Our Competition Plates are designed with a steel core to bounce less when dropped. The lesser bounce translates to a lesser force exerted on the barbell, which means the center ring is saved from impact and damage. Less bounce also allows you to predict where the bar will travel when dropped, making them a trustworthy bar to use in smaller spaces or when working out with others. This allows you to focus on your form, challenge yourself with more weight, and crush your PRs!UNLIMITED VERSATILITY – Whether you are purchasing plates to go with Barbells or to use on their own, they bestow innumerable options. From well-known squats, deadlifts, and presses, to lesser-known halos, raises, twists, and plyo moves, one order of Weight Plates brings 100’s of new exercises into your workout routine. Perfect for home gyms, CrossFit boxes, and school weight rooms. COMPETITION-LEVEL DESIGN – These Competition Plates are perfect for any Olympic or power lifter, body builders, or toners/sculptors. They are Olympic Weight Color coded for easy identification, which is perfect for competitions. The plates fit on a standard Olympic, power-lifting, or hex barbell or any other bar with a 2”-diameter sleeve. Their steel, chrome coded core provides a low bounce and a sharp aesthetic, perfect for when you want to display your strength on the platform!