ARK Tri Chews offer a wide variety of shapes and textures for chewing and mouthing. Each 'Point' of the Tri Chew has a different shape and surface in addition to the different textures on each of the sides of the triangle.
Add to that two different firmnesses of plastic and Tri Chews are very versatile.
Standard firmness Tri Chew is Yellow. The firmer Tri Chew XT is Green.