Petmate's Booda Bone Really Big Wheat-Free Dog Chew Bone Treats are made of modified food starch, glycerin, dried yeast and lecithin with no animal by-products, preservatives, or additives -all wholesome ingredients. Modified food starch assures that the bones offer a healthy and dissolvable alternative to nylon chews. They do NOT contain any plastics. Additionally, BOODA Bones contain only natural colors and flavors. 6" x 2-1/4" x 5/8"