GG Equine GreenGuard Diet Muzzle InsertWe love the GG Equine Green Guard Diet Muzzle Insert because it is made from a soft, pliable, rubber like material, that is non toxic. It is secured into the bottom by pushing the insert tabs through matching slots* in the muzzle. Very secure once in place, these inserts can be removed but will take a bit of work to get out. But this is a good thing as it means your horse won't remove it before you do! The "diet" insert has 50% smaller holes to