Dumbbells that are movable and adjustable Dumbbell details Made from the best treated materials that are resistant to rust and breakage, it has a soft texture that is appropriate for use by both men and women, and it has a comfortable grip that doesn't hurt the hands. The required weight is determined by adding the combined weight of both hands when filling the dumbbells in pairs (each hand is one piece). For instance, if we use 40 kg dumbbells, the right hand would hold 20 kg of weight and the left hand would hold 20 kg. Dumbbell advantages Dumbbells are vital and necessary for sports in general, whether or not they are used, to maintain physical fitness.