Universal Perforated Disposable Plastic Impression Trays, 120 trays/Pk (12 trays X 10 bags - each bag contains 2 pcs medium upper + 2 pcs medium lower + 1 pc each other size - LU (Large Upper), LL (Larger Lower), SU (Small Upper), SL (Small Lower), PA (Quadrant, Upper Left / Lower Right), PB (Quadrant, Upper Right /Lower Left), P1 (Anterior Upper), P2 (Anterior Lower). Pack of 120 trays