The Marcy(R) Kettle Bell has a patented eco-friendly design that is made of recyclable cast iron material. For added durability it is designed to not rust. Pump Iron Durable Hammertone finish Eco-friendly weight plates Non-rust weight plates Made of Recyclable material that is healthier for the environment Available in 10, 15, 20, 25, 35, 45, and 55 lb