Build a professional-looking gym in the convenience of your own home with j/fit Rubber Hex Dumbbell Set. The rubber-coated hex dumbbells are made from solid cast iron with a six-sided anti-roll design. Weight options: 5-lb, 8-lb, 10-lb, 12-lb, 15-lb, 20-lb, 25-lb, 30-lb, 35-lb, 40-lb, 45-lb, 50-lb. About j/fit J/fit is committed to providing high-quality fitness equipment at reasonable prices. The selection has expanded from 10 products to over 300 in order to meet the needs of the marathoner, the beginner, and everyone in between. The fitness world is constantly changing, and j/fit aims to be on the forefront of the latest technology at each juncture.