bintiva Professional Grade, Non Slip Grip, Neoprene Coated Dumbbells - 1 Pair The Bintiva dumbbell is crafted from professional grade cast iron, and coated with non-slip neoprene to improve grip and protect the user. Hexagon shaped edges prevent the dumbbell from rolling while not in use. The dumbbells are color coded by weight so that they can be easily identified during a workout. Weights are an ideal enhancement for almost all fitness, exercise, weight loss, strengtening and training routines. They are compact and an asset to any home gym. The neoprene coating also helps protect the exercise surface.