PROIRON dumbbells are suitable for targeted strength and endurance training. Our dumbbells are available in different weight classes (from 1 kg to 10 kg). Premium solid cast steel interior with soft touch neoprene coating, the soft neoprene surface is superfine treatment, easy to clean. Never wither or crack in your daily exercise. Textured surface makes it easy and comfortable to grip, won't slip when sweating. It has a little flat to stop rolling on the floor, easy storage. Materials are strictly selected, free of phthalate and lead, etc. It is healthier and safer in your daily exercise.