The Brunswick Custom-Matic Bowling Ball Sizer is used by professionals and amateurs alike as a guide for customizing bowling balls. Professional bowler Marion Ladewig has been photographed with the Custom-Matic, attesting to its popularity and high regard. The Brunswick Custom-Matic Bowling Ball Sizer consists of a thirteen pound ball drilled with four rows of holes of different sizes marked A through U. A metal plate on the back of the wooden display features a finger size chart. The backside of the display holds several small circular cubbies for storing supplies and accessories.