The pet rope ball is composed of three layers, natural rubber outer skin + nylon winding + high content butyl liner. The outer covering layer with a higher proportion of natural rubber has a higher ball distance. The ball itself is a pet The specially designed style allows you to play with the pet on the grass with a ball when you go out to play with your pet. Because the ball is exclusively for pets, shouldn't the gas in the ball be too large? If the gas is too large, the pet will not be able to bite the ball. The gas for the pet-specific ball is generally recommended. This ball is for people to bring pets to play with. Be sure to pay attention to the safety of pets during the play. Remember not to throw the ball too far, just keep a certain distance.low price Rubber Toys Ball website:http://www.widersportsball.com/rubber-toys-ball/