【Steel core】 PROIRON weights dumbbells set are built to the highest standards of quality, each hex dumbbell weight feature a solid steel, tough and stronger than ordinary hex rubber dumbbell set. As hex weights set is made of pure steel, the size is much smaller, so our hand weights is more suitable strength training for home, gym or office exercise. 【Odorless & never fade】Unlike other hex rubber dumbbells has stink and fade, PROIRON dumbbell weights is encased in high density and environment-friendly coat, make sure hex weight odorless for your healthy workout. Our rubber dumbbells set reduces noise and never fade, protect home and gym floors/equipment from damage. In addition, our home dumbbells pass various tests in european laboratories to offer healthy fitness 【Sturdy & Anti rolling】 Our rubber hex dumbbells set adopt the latest friction welding technology, never to loosen, secure and anti-impact, Special as high-end commercial or home weights such as gym/hotel/club. Unique twelve-sided shape prevents weight rolling away. Flat edges are easy to store on the floor without rolling around, and easily stack on top of one another. Our rubber weights dumbbells set also allows for core exercise such as press-ups and planks in safer condition 【Exquisite metal handles】 The delicate knurl on the handles increase hand friction, enhance strong grip and prevents hex weights slipping and causing injury. Curved steel handles are professionally built for hand comfort and ergonomics, provide a comfortable and secure grip for weights set dumbbell set, improved confidence and stability 【Versatile rubber dumbbells】 Exercise fitness dumbbell is great for tones & builds muscle strength, PROIRON dumbbells will expand your exercises including curls, lifts, presses, squats and burn calories faster, increase endurance. We provide hex dumbbells weight 3kg 5kg 8kg 10kg in PAIR. Hex dumbbells weight 12kg 16kg 20kg 24kg come in SINGLE. We are confident you will love our rubber dumbbells as much as we do. That is why we guarantee you a full refund if you're not completely satisfied!