The Jolly Pets Romp and Roll 4.5 in. Dog Fetch Toy is great for just one pooch or a multi-pet household. The rope is knotted on each and can be pulled back and forth through the 100% non-toxic polyethylene plastic ball. Balls float and bounce. Romp and roll balls do not need to be inflated which makes them long lasting and fun. Pink colored balls are bubblegum scented.