Gross for one! Gross for all! We play with our.Madballs! Madballs and Kidrobot have teamed up to present the Madballs 1.5" Keychain Series. This series features 16 classic Madballs characters from the popular 80s toy series. This makes the perfect sick accessory for any set of keys! They also work as a zipper pull to add a gross out air to any backpack, purse or jacket! Collect them all and have freaky fun for everyone!.