COE Spacer Disposable Trays (with the unique zigzag spacer bar designed into the occlusal surface) allows you to seat loaded impression trays to the correct depth, time after time. Designed in a variety of sizes, these impression trays are available in either perforated or solid styles to accommodate the majority of preferred techniques. Disposable Strong, rigid plastic Unique, zigzag spacer Anatomically designed Perforate style/solid style