mammoth tirebiter ii® are made from a new advanced natural rubber formula for extra long lasting play. these real tire tough favorites are fun and perfect for interactive playing, tossing and tugging. mammoth® flossy chews® are made from premium quality poly-cotton yarns ideal for interactive playing, tossing, and tugging. this toy is designed for strong chewers and is perfect for interactive playing, tossing, and tugging. this toy is perfect for maintaining good dental hygiene while playing, tossing, and tugging.