Metro Balls® are the perfect colorful addition to your pet's toy box. Unlike standard tennis balls, Metro Balls® are specially designed with your pets in mind. * Made with natural rubber and cotton yarn. * They have ZERO petrochemicals, making them a better choice for pets! * Metro Balls® are 2.5" in diameter, comparable to made-for-human tennis balls. Mini balls are 2" in diameter. * With 6 color options available, get them in your fur-kid's favorite color! * Each package contains 3 color-coordinated balls with various two-color designs. * Dog-approved bounce! * Balls will NOT stain your carpets.