This inflatable donut is smaller than the other available donuts (such as FitPaws and Flexiness), with a sturdy matte surface. 
It is a thicker material that is a little more stable than similar products but still provides a great challenge as it is unstable in all directions. 
This donut measures approximately 45cm across when inflated. It will have creases when first inflated from packaging. 
This piece of equipment is a higher level of difficulty,  for intermediate to advanced dogs with a high base level of fitness and experience.