Two size ring options (Big Ring) --- Outer diameter is 11.8inch/30cm, and thickness is 2inch/5cm,Weight: 0.22kg/0, 47 lbsSuitable for medium and large dogsSmall Ring--- Outer diameter is 7inch/18cm and thickness is 0.98inch/2.5cm, Weight: 0.06 kg/0.13 lb l Suitable for small dogs Puppy cat Elastic tear-resistant EVA material: our large dog ring toy is soft and stretchy, can be used to train the dog's reaction throw , grabbing, fetching, pulling, tugging, etc., which are harmless to teeth and gums, and can also be used as dog molar toys to help dogs develop. Good Chewing Habits. Water Toy: This fitness ring floats in water, not only is it great on land, but also can be played in the pool, river or lake. Build Relationships: This pet agility set can help nurture the relationship between pet owners and pets while teaching them new tricks, which benefits both to you and your pets. Humanized design: This product is designed with a ring and has no sharp edges, do not worry that your fingers will be scratched; and it is very easy to clean, just wipe it with water or a cloth.