This unique silicone training ring has a rounded wing that can hold up to three small weights. Each of the grooved holes carries a removable steel ball weighing 57 grams that locks securely into place for all play activities. The stretchy and comfortable ring has a simple design that gradually increases the weight up to 171 grams for good support and strengthening. Can be immersed in water and is easy to clean. Weighted silicone training ring / Three removable 57 gram weights / Made of silicone, weights made of steel / Height: 7.7 cm / Depth: 3.5 cm / Width: 5.2 cm / Waterproof & submersible / Phthalate and latex free