It's an anterior arch tray. It's a facial plane relator. It's two devices in one.

The Harmony Anterior Dual Arch Tray features: 

• Extremely rigid, fully-attached inter-occlusal mesh to minimize water absorption and ensure an accurate bite.
• A facial midline tool which can be used optionally to ensure accurate bite registration. No more slanted crowns or veneers!

The disposable Harmony Anterior Dual Arch Tray captures the prepared teeth, the opposing arch, the bite registration, and the patient's facial midline in one simple step. The Harmony Anterior Dual Arch Tray can be used without alignment sticks for single units, or with them for multiple units.

Independently Reviewed & Recommended.
In an extensive study done by an independent dental products evaluation organization, 73% rated the trays as excellent or good and worthy of trial by colleagues.

The Harmony Trays were designed by a working dentist to be an improvement over typical trays on the market.