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. These dumbbells come as a pair and are clearly marked in pounds and kilograms. These Light Blue dumbbells weigh 4-pounds each.