Product composition structure: 80% cement, is household environmental protection, this set of formula uses environmentally friendly PE PE, filled with a mixture of fine iron powder to protect the ground from corrosion. Description: This high quality dumbbell set is made of high quality materials. It comes with different sized weight plates to adapt to your desired dumbbell weight. With it, it can avoid causing damage to the ground. Featrues: Color: Black Material: PVC Made of high quality material, durable to use. Comes with different sizes weight cap to adjust to desired dumbbell weight. Comes with different sizes weight cap to adapt to your desired weight. With comfortable band to prevent slipping when exercising, which can ensure your safety. We have added cement concrete of this dumbbell Packing list 20kg dumbbells 4 x 2.5kg dumbbell disc 4 x 1.25kg dumbbell disc 2 x 0.5kg dumbbell disc 2 x 35cm extension bar 4 x nut