Build strength and your endurance with a pair of these 1kg wrist and ankle weights, they can also help to improve muscle tone and aid your weight loss goals. You can use them for almost any cardio workout, in the gym, at home, walking, jogging, running, cycling, and more! For a comfortable fit, they are made from neoprene which is breathable and wipe clean, filled with iron sand which molds to your wrist or ankle's and has a secure metal D-ring velcro closure system.