CanDo® vinyl coated dumbbells are made of cast iron and are conveniently color-coded according to how much they weigh. These dumbbells feature a vinyl coating which is comfortable to grip and does not allow the dumbbells to scratch the flooring. They are ideal to use for upper body exercises, physical therapy, weight training and toning workouts. The CanDo® Vinyl Coated Dumbbell – 10-Piece Set includes a pair of each of the 1, 2, 3, 4 and 5-pound dumbbells. These dumbbells are clearly marked in pounds and kilograms.