The same soft polishing cup is used for all 5 Zooby prophy angles. It's designed to hug children's teeth and keep the paste from splattering excessively. At the same time, it's also small and slim enough to reach into a narrow mouth opening. The polishers for the Zooby disposable prophy angles are white; except for Penelope, the penguin lady, who has a red beak (= rubber cup).