100% whole chicken backs from young fresh birds. Good source of calcium and phospherous with nearly a 1:1 ratio. A soft easy chew great for cleaning teeth and mental stimulation. No hormones, no antibiotics, no fillers and no preservatives. NO organ, approx. 45% bone, 55% muscle meat. Hormone, antibiotic, presertative free. Hormone, antibiotic, presertative free. Human grade sourced.