Rep Fitness Dumbbell Set Features Made from premium low odor rubber, our dumbbells are a classic rubber coated hex dumbbell design that is quiet and easy on your floors. Unlike slippery ""ergonomic"" handles that only have knurl across part of the handle surface, our full knurl gives you a secure grip at any weight. This feature is usually only found on premium ""pro-style"" dumbbells costing more than twice as much. Rubber Hex Dumbbells vs Adjustable Dumbbells More convenient and durable, a rubber hex dumbbell set can last a lifetime and is a great investment in your health. A rubber dumbbell set is great for a huge variety of exercises, and never goes out of style. Standard equipment in any serious gym, a 5-50 dumbbell set or 5-100 dumbbell set allows you to develop real world strength by moving heavy objects in your hands. It doesn't get any simpler. Handle diameter is 28 mm at 5 to 20 lb weight, and 34 mm at 25 lb and above. The thicker 34 mm handle adds comfort on heavier weights. Dumbbells heads are securely attached via press fitting and welding. Product will ship via Freight truck, which means there must be a valid phone number with the order and the shipping address must be accessible by a 40' semi-truck. You must be available to make a delivery appointment during the week. If your home is inaccessible, we recommend finding a business address that will accept it. If the freight company is unable to reach you via phone, there may be additional charges incurred for storage and/or return shipping. Lifetime warranty for home use. 3 year commercial warranty.