2-piece mold. White silicone bottom, transparent silicone top. See your dessert in crystal clarity at its progressive stages of preparation. Temperature resistance of silicone -60 to 230C (-76 to 446F). Included in this set is a clear polycarbonate tray resistant to cold as low as -40C (-40F). The tray, which the mold fits into, measures 11.5 cm x 39.3 cm x 1.2 cm high (4-1/2 inches x 15-1/2 inches x 1/2 inch high). Though not sold as a separate item, this tray matches in measurement Silikomart's VGEL03 colored plastic trays (which are sold separately). The see-through top has a hole in each cavity to let you fill it without separating the two silicone parts.