The Mammoth 3 Knot Tug with Tennis Ball is made from a cotton blend and braided into a rope. It features 3 knots, 2 above the tennis ball and one below. It includes frayed edges on both sides for something to grip onto. The rope fibers work to clean off tartar and plaque buildup to keep teeth and gums healthy. This tug is built to be durable for even the strongest chewers. It can also be used to fetch, swing, bounce, tease, catch and so much more. The mini measures 11" and is recommended for smaller dogs.