Stable Box-Type Water Pillow - No Instructions Powder is added to prevent the inner rubber from sticking together. The clasps are rusty in places. 1. Stable Type The center part is connected at the top and bottom, so the head does not wobble and is stable during use. 2. One-Touch Type The mouth opens wide with just one hand, making it convenient to add ice. 3. Leak-Proof Type A leak-prevention groove is attached to the inner surface of the mouth, so you can use it with peace of mind. 4. Patterned surface Size: 45 x 18 cm, Thickness 3 cm