This ergonomic dumbbell set has a total weight of 66 lb (2 x 33 lb). The dumbbells have anti-slip plastic handles, and the screw-caps have star bolts to make sure that the weight plates are always mounted firmly and securely on the bar.The weight bar is composed of strong metal with a grip surface of approximately 5.7". The weight plates are covered with robust, floor-friendly plastic, which eliminates the clanging sounds of the weights.2 x 1.1 lb Dumbbells: 1" (Φ) x 1' 6" (L)4 x 2.2 lb Weight plates: 6.1" (Φ) x 1.1" (T)4 x 2.7 lb Weight plates: 6.7" (Φ) x 1.2" (T)8 x 5.5 lb Weight plates: 8.3" (Φ) x 1.6" (T)Number of star locks: 4 (suitable diameter 1")Filled with sand