Canadian Brand. Rollover Medium Porkhide Rolls (bulk) are 100% digestible porkhide, made from the inner layer of pork skin. No chemicals are used in the processing of these chews and porkhide is a much healthier alternative to traditional beef rawhides. These low fat, high protein chews are a great way to help clean the teeth and gums and since porkhide softens when chewed, are an excellent option for all medium sized dogs, from puppies to seniors. Each Medium Porkhide Roll is approximately 6" in length and 1/2" in diameter and this bulk box is a great value.