High Durability: Cast Polyurethane is an extremely tough, impact-resistant material. It is more resilient than other coatings like vinyl, neoprene, or standard rubber, making it highly resistant to chipping, cracking, or peeling, even when dropped or banged together.

Surface Protection: The coating acts as armor, protecting both the bell itself and the flooring beneath it. It absorbs shock and reduces the noise associated with metal-on-metal impacts.

Consistent Shape: These are often manufactured using a "block mold" process, which ensures the weight is well-balanced and the shape is consistent across the product line. Many also feature a flat bottom, which provides stability for floor-based exercises like renegade rows or push-ups.

Handle Design: CPU kettlebells often pair the durable coated body with a high-quality steel handle, frequently finished in hard chrome. This finish is intended to be smooth and rust-resistant, which helps reduce friction during high-repetition movements like snatches and cleans, minimizing hand tearing and callus buildup compared to rougher cast iron handles.