Tough By Nature Good Cuz walking balls are made from 100%-natural rubber with molded feet to produce an irregular bounce. Each one has a distinctive squeak. Great fun to grab and toss. Add some zip to your toy selection with these unique "walking balls!" Tough By Nature Good Cuz Walking Balls are made from 100% natural rubber. These fun and funky balls with feet produce an irregular bounce and distinctive squeak for each of the sizes. Feet make these toys easy to grab and throw. Bright, colorful, and exceptionally durable dog toys are perfect for chasing, chewing, and tugging. Assorted colors of blue, orange, and lime green. Colors may vary. Small: 2 3/4"