The polyurethane dumbbells are made of alloy steel pressed onto solid steel with a complete outer welding. The structure of these dumbbells are very compact to achieve maximum strength, avoid damage, and secondary maintenance. The head is up to 8mm thick with a polyurethane layer with excellent shock absorption and buffering ability. This can effectively protect the floor and surrounding equipment. The handles have a medium intensity diamond knurling that improves grip and comfort. The handle surfaces are plated with hard chrome that do not easily rust and extend the dumbbells lifespan. These dumbbells have an excellent performance history and are priced moderately. You can perfectly exercise your bodied muscles with them.