Premium Construction & Durability: This 150lb(Pair of 5, 10, 15, 20, 25 lb) dumbbell set made from solid cast iron and encased in high-quality virgin rubber, these dumbbells resist cracking, fading, and protect both floors and equipment. Odor Free & Ready to Use: Made with premium odorless TPE material, our dumbbell has no harsh chemical smell. It's ready for your workout right out of the boxperfect for indoor home gyms and spaces where air quality matters.