Waterflying Dumbbells Material: PVC Atyels: Flat and Massage Styles Weight: 1.2kg, can be injected to 6kg Function: Burn fat, slim hips and keep fit Features: 1.) Easy to carry out, empty water when taking out, convenient to use, water can be filled in anytime. 2.) 1.2-12 lbs adjustable, kettlebell weight can be adjusted according to the amount of water. 3.) Made of environmentally friendly PVC and PC material, can be used for a long time, never rust. 4.) Integrated drop molding design, the handle is anti-skid and anti-collapse, prevents palms from getting sweaty, comfortable to grip and use. 5.) Suitable for gym, fitness, sports, weightlifting, yoga and a variety of exercise.