1Plastic Material: The product is made of high quality plastic, sturdy and durable, so there is no need to worry about water leakage during use. 2Leakproof Design: Double layer lid design, there is no worry of water leakage when using, and can be used at home and office anytime, anywhere. 3Suitable for: After being filled with water, the weight is about 1kg/2.2lb, very suitable for fitness enthusiasts and anyone interested in sports. 4Low Impact Workout: Build muscle or burn fat without straining your joints. Develop your upper body and get maximum results with minimum impact. 5Space Friendly: Dumbbells are great home workout equipment no matter how small your home is. Just grip your dumbbells and get started.