The Body Solid SDX Gray Hex Dumbbells are available in from 2-100 pounds. The heads of the dumbbells are cast completely around and through. Two high carbon Roll Pins are permanently embedded in the steel handles to ensure they won't break. The hex shaped dumbbell heads prevent rolling and assures safer workouts. Raised silver numbers for easy readability and quick selection. All edges and corners are ground smooth for safe handling. Cast from ASTM grade 20, the highest quality gray iron casting available. The Body Solid hex dumbbells feature extra-thick, stress proof, knurled steel alloy handles.