5KG Rubber Coated Hex Dumbbell is one of our Rubber Dumbbell products. Rubber Dumbells are metal Dumbbells with rubber coating. They may be fully encased in rubber or simply have rubber-coated balls or plates.One of the main benefits of a rubber dumbbell over bare chrome or cast iron is that the rubber offers a protective outer coating that protects both the dumbbell, the storage stand and the surrounding lifting area. Scratches, chips and dents are easily noticeable on metal weights, but are far less common on Rubber Dumbbells. Rubber dumbbells also help to reduce noise when they are dropped by the user.