3D pop it stress ball is made of high-quality silicone material, durable, BPA-free material, waterproof and can be washed repeatedly and reused. The unique tie-dye color pattern can attract the attention of children and adults. When you press these bubbles, they will make a "pop" sound. Then firmly hold the decompression ball, you will feel the bubbles pop instantly! This is a very pleasant relaxation process, allowing you to have fun at any time!