SOLID MATERIALS: Solid cast iron kettlebell with a durable neoprene coating reduces noise and protects flooring; This neoprene coated kettlebell has no seams, weak spots, or welds. MULTIPLE OF WEIGHT LEVELS: A wide range of weights starting at 5 lb kettlebell and going all the way to 50, 60, and 65 lb for upgraded challenging; Color coded by weight for users to easily find a kettlebells set that matches their strength.