Ivory N.16 [0.05mm (0.002in)] Perforated – to provide and maintain shape for the restoration while the restorative material hardens. To confine the restorative material within the cavity preparation and pretermined surface.Package of 12 pcsFor Matrix Retainer Ivory 1, Ivory 12 and Ivory 12a FOR MOLARS, especially when the contact with adjacent teeth is very narrow. MATRIX NYSTROM NARROW mm0.05 - 12 pcs