A 20 oz vacuumed sealed double walled tumbler. Featuring over 7000 glass crystals, easy grip with slider lid and stainless steel straw. - 100% Food Grade stainless Steel - Shatter Proof - Sweat Proof - Stones permanently affixed between guard rings. - HOT or Cold / Holds temperatures for hours - Slider opening on lid prevents spills but allows straw access. - Clear Non-Toxic BPA Free Lid. Caring for your Cannabis Cup - Not Dishwasher Safe - May use soft brush over crystals - Hand was with non abrasive cleansers - Do not soak