The VTX 12-Sided Cast Dumbbells are made with ASTM- Grade 20 Casting preventing them from rusting, chipping or peeling. The 12-sided head also prevents the dumbbell from rolling. The handles are contoured giving you a solid comfortable grip. These dumbbells have a pinned head design to resist breakage. They are sold as singles but can also be bought in pairs. These dumbbells are very affordalbe and are made of great quality. They are available in 3, 5, 8, 10, 12 and 15-100lbs in 5lb increments.