Precision leak-proof design, upside down, no bumps on the outside.4.
Good sealing, no water leakage, very durable. Water sports dumbbells, water dumbbells are creative and practical, the weight is adjustable, and the water volume is controllable, depending on your needs. * Material: PET material, BPA free* Size: S: 550ml; L: 1500ml* Feature:1.6.