All of our sublimation tumblers are made using a tumbler heat press machine to ensure the end result is of the best quality. The tumblers are 20 oz / 600 ml and they include a clear acrylic, straw and straw cleaner. The tumblers are completely straight not tapered and they are 18/8 304 food grade stainless steel, double walled, which can ensures drinks stay at the right temperatures for hours (hot 6+ hours, cold 12+ hours).