With extra clearance for ortho patients, DuraLock™ Plus Impression Trays are specifically designed to optimize comfort, handling and alginate retention. Available in six color-coded sizes to fit any patient—with or without braces. Advanced medical-grade polystyrene plastic. Disposable or cold sterilizable. DuraLock Plus Impression Tray Introductory Kit with five trays of each size, 60 total, per bag.