Fixed Rubber Dumbbell 1. We are manufacture 2.Rubber coated outside, cast iron inside, steel hanlebar 3.Weight: 2.5KG--50KG Fixed Rubber Dumbbell-ZDfrd23: This rubber dumbbell : cast iron inside, rubber coated outside. Steel handlebar. Weight: 2.5kg, 5kg,------50kg, 2.5kg increment. Michael Lv