SpaceBalls also eliminate annoying panel rattle. Panel rattle occurs when a door panel shrinks due to low humidity conditions. This small amount of shrinkage allows the panel to move in the door frame, causing the rattle sound. This rattle can be heard as doors are closed. When SpaceBalls are incorporated in the door frames, panels are cushioned and always supported, avoiding ” panel rattle “. The door is solid and soundless, always cushioned, centered.