Harmony Dual-Arch Trays are designed to capture the prepared teeth, the opposing arch, the bite registration, as well as the facial midlines with one earth-friendly device made from corn starch. The Posterior Trays have a narrow stainless steel bar at the back that is only 2.6 mm in diameter, preventing tuberosity impingement, while still giving it rigidity equal to or better than any other disposable dual-arch tray. The Anterior Trays can be used without alignment sticks for single units or with alignment sticks for multiple units. Features and Benefits • Convenient and accurate • No more slanted crown or veneers • Earth-friendly