HEX DESIGN: The hexagon head design prevents the dumbbell weight from rolling, creating ease of use and the ability to stack for storage. Engineered to fit the Dumbbell Weight Power Rack. SPECIFICATIONS: Handles feature an ergonomic chrome-plated handle. Weights are built to a tolerance of +/- 3%. High quality solid cast iron dumbbell encased in rubber, dumbbells will last throughout the years while protect your floor. SOLD IN PAIRS: Packaged and sold as sets of two weights Powertiger Dumbbells are sold in pairs and available in weights ranging from 1kg to 50kg. This standard rubber hex design is a great, budget-priced option that still delivers on quality, performance, and longevity. The heavy-duty, rubber-encased heads minimize noise and limit wear and tear (to both the bells and your flooring), while the chrome-plated handle is ergonomically designed for a firm but comfortable feel in any grip style. We can guarantee that all dumbbells will include a welded construction, knurled steel handles, weight indications on two sides of the head, and a strict weight tolerance within 3%.Dumbbell training has stood the test of time for good reason. Along with the versatility in weight choices for multiple athletes, a good set of bells can be used to duplicate nearly all types of barbell exercises, while also offering a wider range of single-arm, rehab-specific, and explosive movements in virtually any sized space—something not possible with bars or most weight room machines. Of all the styles of dumbbells, the most common is the hex dumbbell. Hex dumbbells are generally the best combination of price and durability for most home gym owners and smaller commercial gyms, but for the most part, they are very average–nothing overly appealing about them with mediocre durability, but they get the job done.