Design features: There are thorns on the surface of the toy, which can help dogs clean their teeth. And there is a water injection hole, you can inject clean water or pet drink in summer and use it for your pet after freezing. How to use: Put the water injection hole into the water and squeeze it until it is full of water; then put it in the fridge for 5-8 hours. Specifications: Condition: 100% new Material: TPR Color: As Pictures Show Size & Weight: Molar toy bone shape: 17.59cm, weight 128g Fish shape molar toy: 13.57.5cm, weight 116g < p>Spherical molar toy: 7.5*7.5cm , weight 111g Package list: < br/> 3 x Pet Molars Cooling Toy < br/> Note: Due to manual measurement of the product, there is an error of 0-2 cm /g, please understand.