Outward Hound Kyjen  Dog Games Seamsters Made of vanilla-scented, natural, non-toxic durable rubber and stitched with thin, knot-free strips of rawhide No need to worry about knots or large awkward shapped pieces that might choke a dog The entire package is irradiated to ensure the rawhide is sterilized, it is also non-flavored, non-colored and contains no knots