Troy Pro-Style Dumbbells are professionally pre-assembled to ensure they meet the standards required in heavy use and commercial applications. All dumbbells utilize bigger, steel alloy bolts that are longer and stronger than the competition. Troy Pro-Style Dumbbells feature 27MM straight or contoured handles with special, deep set knurling for functional performance and Troy premium grade, black textured or Grey Hammertone, machined plates. The steel, chrome or rubber end caps include the TROY name and numbers tags for easy ID.