CAP Barbell 280 lb. Eco Dumbbell Set with Rack 5 to 35 lb dumbbells in 5 lb increments for a total of 280 lbs Dumbbells are made of cast iron Includes a two tier vertical dumbbell rack made of durable steel construction to keep your dumbbells organized. Baked-enamel coating creates a protective barrier against rust, chipping, and dents. 5 to 35 lb dumbbells in 5 lb increments for a total of 280 lbs Dumbbells are made of a combination of material and cast iron Includes a two tier vertical dumbbell rack made of durable steel construction to keep your dumbbells organized. Baked-enamel coating creates a protective barrier against rust, chipping, and dents.