Competition Plate - The plates are color-coded per IWF standards. High end Olympic weightlifting bumpers delivered very minimal bounce Steel Insert - With a 50.6mm collar opening, these plates are compatible with standard Olympic-sized barbells, providing versatility for various exercises and workouts Raised Rubber - Raised edges to prevent metal-to-metal contact. It also allows for easy gripping and handling of the plates Great Looking - Raised lettering for a bolder look. Come in four vibrant colors (Red/55LB, Blue/45LB, Yellow/35LB, Green/25LB) Labeled in both KG and LB for your convenience