... etc. rubber dumbbell 1.material:rubber coated.2.specification:on demand 3.benefits:training muscle rubber dumbbell specificationmaterialdescription ... some outsourcing is a layer of rubber. 2.specification: the middle is the iron bar, both ... 1 pound = 0.4536 kilograms) and so on. The weight of heavy dumbbells 10,15,20, ... 25,30 kg and so on. , ranging from circular iron plates, about 40 ...