Rubber dumbbells, such as rubber hex dumbbells, are also made out of iron but the heads are coated with thick protective rubber. These are great to help protect your dumbbell racks and gym floors with solid metal chrome finish contoured (ergo) handles designed to fit comfortably. A textured handle provides a tight and secure grip. Hexagon-shaped rubber-encased heads help prevent rolling and provide easier storage. These beautiful black dumbbells are made to a perfect finish with high-quality rubber. The handles are made with a smooth chrome finish to fit comfortably in the user’s arm. The dumbbell comes hexagonal. The main benefit of hex dumbbells is that they don't roll. If your floor is even slightly uneven (as many floors are), rolling can be a big annoyance. Rolling can also be hazardous, especially when heavy dumbbells roll over your feet.
Hex dumbbells are ideal for home gym owners due to their affordable price. They're also better for CrossFit and functional fitness because you can do floor-based exercises with them, and they won't roll when they're on the floor.