Livepro’s high end rubber dumbbell design is stylish, 8 sided, stable, will not easily roll, and is very safe. They have alloy steel handles that are completely pressed on with solid iron, welded outside to achieve maximum strength, and pre-vents damage/any secondary maintenance. The head of the dumbbells are a rubber layer that is up to 15mm thick with a large shock absorption and buffering ability. The dumbbells effectively protect the floor and any surrounding equipment. The handles have a medium intensity diamond knurling that improves grip and comfort. The hard chrome outer layer will not easily fall off like other types of knurling that will peel and rust.