BENEFITS:– Single ingredient– Long lasting– Odorless– Promotes dental health– Brain stimulation ABOUT:BarknBig’s 5-6” Bison Bully Sticks are made from USDA-inspected bison pizzles. This odorless chew is safe for indoor enjoyment and is a long-lasting bully stick that will keep your dog entertained for hours on end. BarknBig bison is premium quality because we source only free-range, grass-fed, 100% USA bison.