Tennis Ball Holder

My brother plays a lot of tennis. Often he goes to large tennis tournaments to see the pros, such as the French Open, US Open, and Wimbledon (apparently Australia is too "dangerous and hot" to see the Australian Open). When he gets the standard-sized tennis balls signed by the pros, he likes to keep them in a trophy case. Here I designed a special storage idea for the tennis balls, which should fit snugly if within the tennis ball standards. The 1.1 Small is for standard balls, the 1.1 Medium is