Zanies® Cosmic Cones Are Made Of Extra Hard Rubber For a Chewing Experience That's Out of This World Zanies Cosmic Cones are made of dense, hard rubber designed to withstand even the most aggressive chewers. Fun cone shape is easy to grab and ideal to gnaw to encourage dog's natural chewing instinct. Grooved design helps clean teeth and stimulate gums and the dimpled surface adds textural interest. Hollow center can be filled with treats to add an intellectual challenge for dogs prone to separation anxiety. Toys are packaged with a header card. Zanies Cosmic Cones are available in the sizes listed below. Colors correspond to size.