Features: Water-filled dumbbells can adjust the weight of dumbbells freely according to the amount of water. Before the water is filled, the weight is only 1.5 eggs, which is convenient for travel and reduces the burden on you. In addition to the screw-type waterproof cover, it also has a built-in silicone sealing plug, which is double leak-proof, which greatly reduces the possibility of water leakage. High-quality PE material, carefully selected materials, safe and non-toxic, wear-resistant and anti-aging, stable in nature, acid and alkali resistance, and low temperature resistance. Anti-rolling design, intimate anti-rolling buffer zone, to avoid rolling caused by ground tilt or external force. Suitable for most daily use scenarios, allowing you to exercise all the time. Package Includes: 2 x Water Bottle Dumbbell Shaped Specifications: Material: PE+PP+Silicone Weight: 100g Color: Gray/Pink Total Length: app.262x97x94mm/10.31x3.81x3.7in note: Please allow 0-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you