Pirate Childrens Birthday Party Supplies - Skull Plastic Sippy Cup with Straw (16) Includes 16 Pirate Skull Molded Plastic Sipper Cups with Straw. Holds approximately 16 oz. Add additional party tableware, kits, decorations, favors, games, and activities to complete your celebration and entertain your guests. Great for childrens birthday parties, kids school parties, a pizza party, sleepovers, prizes, favors, or a theme party. Perfect for fans or pirates of the carribbean, ships, seas, or sailing.