This beautiful GLOW IN THE DARK 20oz Stainless Steel Tumbler is PERFECT for holding your hot and cold beverages. The design is infused into the tumbler and will be permanent. Sweat proof! * 20 oz. Double Walled Stainless Steel Tumbler * Includes slide closure lid, 1 reusable plastic straw. * This is not made with harmful toxic epoxy, there are no chemicals involved during the process of making your tumbler. * Tumbler will be handmade upon order just for you. * Hand wash only is recommended. * Will keep your drinks hot or cold for hours! * Insulated design. * Please note, that color can vary slightly from your screen to the actual tumbler, due to screen resolution/brightness and natural variances. * During the day the Cup will be colorful. When exposed to UV lights the cup will Glow! ***To produce a glow in the dark effect, you need a UV bulb with a wavelength around 365nm which is considered the optimal range for most glow-in-the-dark pigments, referred to as a "blacklight"