Accudent XD Alginate Tray Impression Material, 12 - 24 g Packets. Irreversible hydrocolloid impression material used for dentate and edentulous impressions. Dual-phase for more accuracy and precision than traditional alginates. Premeasured and packaged for predictable and precise mixing. Color Changing properties for precise timing of impression taking. Fast set time for optimum productivity. 12 - 24 gram packets