Keep your workout area organized . clean and most importantly . safe. Our weight trees and dumbbell racks can be placed against any wall or centered in a room. Nobody builds stronger or more space efficient storage units. Heavy gauge steel with all-4-side welded construction is deburred inside and out for user safety. Rubber coated dumbbells 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.