urethane is an ultra-durable rubber that creates a strong, dense weight plate that resists bounces and jumps. Known for their exceptional durability, minimal bounce and resistance to UV damage, these boards are crafted from high-quality German polyurethane to demonstrate resilience in even the most demanding environments.Designed for professional and home gyms, these colorful bumper plates feature custom colored molded markings that blend stylish beauty with long-lasting performance. The 140mm hard chrome wheels feature a one-piece chamfered construction to ensure easy barbell loading and minimize barbell sleeve wear, making them ideal for strength training, powerlifting and Olympic weightlifting training.