Spacer Tray 12/Pk Perforated Medium Lower #21D by GC America SKU 970-1738AA 123 $11.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out #21D Medium Green Perforated Lower Full-Arch Plastic Impression Tray, Zig-Zag Design, Package of 12 Trays.