GC America's COE 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 • Full-arch trays are ideal for larger cases involving three or more units • Nickel Plated Set of 8: One each - 1, 3, 4, 5, 7, 20, 21, 22