Double Wall Vacuum Insulation: Super robust, double wall vacuum with copper lining for maximum insulation! Ensure your drink stays cold or hot for 18 and 6 hours respectively. Note: High temperature in summer and severe cold in winter will affect the duration of insulation and cooling.18/8 Food Grade Stainless Steel: Using highly durable 18/8 stainless steel which has a higher corrosion and oxidation resistance than regular steel can prevent odor and easy to clean. BPA-Free.14oz Mug with Handle: This 14oz mug, 4-1/16” high and 3-15/16” wide, perfect for multiple application, indoor & outdoor.Open Drinking Hole (No Closure): Drink hole on the top for easy sipping. Note: Don’t place it in the dishwasher and hand wash it with warm, soapy water only.Gift Box: The mug comes with a beautiful gift box. Simple and elegant color assortment, perfect gift for all kinds of occasions and meet the preferences of various people.