05-50lb In 5lb increments. Feature durability that simply can't be matched. It resists cracking and fading while protecting floors and equipment. Made from solid cast iron with a 6-sided anti-roll design and encased in rubber, this dumbbell is stylish as it is durable. The end weights are iron, cast with a through hole. The machined chromed handle fits through the hole and is then welded to the end weight. The final step is to over-mold the rubber onto the end weights.