Materials: Aluminum Foil Letters: 13pcs Color: Multicolor optional Size : 16inch/pcs Package : ?Happy Birthday letters x13pcs(16inch) ?1pcs 10m Ribbon (3.9inch) ?Plastic straw x 1pc (5.7 inch) Tip : ? The letter "B" design is special ,before inflating,it looks like the letter "C",after inflating, it is letter "B". ? All Aluminum Foil Balloons are detected by the machines , If air leak occurs while inflating, please press the inflatable hole or use tape to assist the automatic sealing of the balloon. Any problem or you need help, Kindly contact with us , we will solve it for you at once.