Bodum Pilatus 2-Piece 2.5-Ounce Double Wall Glass, X-Small, Clear Individually mouth-blown by expert artisans Feature two walls of borosilicate glass, creating a highly effective layer of insulation Silicone valve at base allows for changes in pressure Also perfect for serving ice cream and soups Dishwasher, microwave safe and oven safe (up to 350 DegreeF/176 DegreeC)