Lift your way to a stronger, healthier body with the CAP Barbell 20 lb. Solid Hex Dumbbells. Exceptionally durable weight equipment is a must for fitness fanatics; that?s why these dumbbells are constructed with solid cast iron. A hexagonal design that prevents rolling when set down means you won?t miss a beat while exercising. Get strength delivered to your door with the CAP Barbell 20 lb. Solid Hex Dumbbells.