These sustainable antler chews are 100% Smurfie approved! He hunted them out in the unit before I could even put them away and he now has one at Plastic Freedom HQ and at home! The reason I LOVE these is because they are from Grade A and AA, Red Deer antler which are naturally shed, responsibly sourced, traceable and sustainable, many from the highlands of Scotland. SUSTAINABLE CHEWS These chews contain a number of good minerals and they are incredibly hard and long lasting. Your dog will find them exciting and irresistible. This is a totally natural product, free from additives or preservatives, its hypoallergenic, just pure and natural!