The Fitness Mad Wrist & Ankle Weights are made from a neoprene material which both breathable and comfortable and also filled with iron sand. These weights are great for using whilst walking, jogging, running, sprinting, during aerobics, cycling, kick boxing, and even treadmill training, or as part of your regular workout. They allow you to buld your strength, endurance and also enhance muscle tone/ aid weight loss. Attached strap with metal D-ring. Comes in a set of 2. Dimensions - 23cm (L) x 8.1cm (W) Colour: Black Material: Manmade Code: KFW4082