HEXAGONAL SHAPE: These rubber dumbbells come in a unique hexagonal shape that keeps them from rolling away when you put them down on any surface. The hexagonal head shape also aids in easy storage on the rack. PREMIUM CONSTRUCTION: The high-grade rubber-coated construction of these pinned cast iron head fitness dumbbells lends adequate durability and protection for long-term use. An ideal choice for both professionals and fitness enthusiasts! ASSORTMENT OF SIZES: Offered in an assortment of weights ranging from 2.5 kg to 20kg, you get the freedom to choose the most appropriate hex dumbbell weight to accommodate specific exercises and individual fitness levels.