The KingsBox hexagonal rubber dumbbells are made of high quality rubber and have a steel core inside. The grip is equipped with knurling and has been coated in chrome for added strength, while the rubber sides increase safety during training with this product. In addition, the rubber helps to prevent damage to the floor in the event of a fall. Dumbbells are sold individually, not in pairs!Diameter of the handle from 1-5 kg is 28 mm. Diameter of the handle from 6-60 kg is 34 mm.