The HOMCOM A91-155: 20KG, A91-156: 30KGS Dumbbell & Barbell is a versatile product, it can help you build your body. Assembly takes just a few seconds, quickly alternate between dumbbell and barbell exercises to focus on muscle strength, endurance, or cardiovascular health. It is very resistant to compression and abrasion, the material of iron sand and Polypropylene ensures the service life of the product.