Planet Dog worked with scientists for a year to perfect Orbee-Tuff®. They succeeded. This signature material is made of all FDA-approved non-toxic ingredients, it`s recyclable and peppermint scented. Now their expertise is molding this material into the most durable, pliable, chewy, buoyant and bouncy dog toys on the market. 5 out of 5 chompers for the aggressive chewers. 4 1/4" diameter.