Grriggles™ Spare Tires. Heavy-duty, textured rubber and cotton rope help clean teeth and gums as dogs chew. # Offer your customers toys their dogs will never tire of chewing # Raised treads and pawprint design help clean teeth and massage gums # Attached tug rope makes them easy to throw and pull # Heavy-duty rubber and cotton rope construction Material: Rubber and Cotton Rope Size: Small measures 5" in diameter x 11 1/2"L (including tug rope) Medium measures 7 1/4" in diameter x 14"L (including tug rope) Large measures 9" in diameter x 18"L (including tug rope)