【Anti-Roll & Comfortable Design】The hex dumbbell is made of solid cast iron with a rubber coating. The hexagonal dumbbell design prevents it from rolling on the floor or falling off the dumbbell rack, and the rubber coating minimises noise, protects the floor and is easy to clean.【High-Quality Material】The hex dumbbell set is made of high-quality steel and solid cast iron, featuring an integrated molding process for compact structure, longevity and durability. Free of cracks, pinholes, and other casting defects; they pass the drop test.【Non-Slip Grip】The dumbbell sets are designed with rubber-covered chrome handles and 1.5mm textured diamond knurling, non-slip and easy to grip, ergonomic grip for ultimate comfort, ensuring safe operation and .