Silver Hollow Point AmmOMug Patented Design makes this travel mug Unique, Bold, and Fun to use. Styled as a Silver Hollow Point cartridge round. Constructed with double walls of stainless steel inside and out for maximum performance. Double walled technology means that this mug keeps beverages hot for 6 hours, and cold for 10 hours. Will hold up to 16 oz. of your favorite beverage and fits most standard car cupholders.