The Rubber-Coated Hex Dumbbells are available in sets and pairs, featuring durability that simply can't be matched. Resistant against cracking and fading while protecting floors and equipment. Made from solid cast iron with a 6-sided anti-roll design and encased in virgin rubber, this dumbbell is as stylish as it is durable. Heads are securely fastened with a uniquely designed pin mechanism that means this equipment is about as low-maintenance as it gets. No spinning or loosening.