GC America's COE Partial Metal Impression Trays have long been the first choice of most schools and dentists worldwide. These GC trays are available in many different sizes, shapes and types including full or partial, solid or perforated, and pediatric. Tray sizes read, the larger the size, the smaller the tray number. Features and Benefits • Rigid, but bendable for an individual fit • Welded, Rimlock borders allow pressure buildup • Nickel Plated • Partial trays are typically used in cases involving one or two units Set of 4: One each - #30, #31, #32, #33