Colorful Birthday Balloons Happy Birthday Cards - 24 Cards & Envelopes 6 Balloon Designs - 4 Colorful Happy Birthday Cards of Each for 24 Total Birthday Cards Colorful Balloon Happy Birthday Cards measure 4.875" x 3.375" (USPS Standard Postage Size) Cards and Envelopes made from 100% recycled stock (White) Designed, Printed and Hand Assembled in the USA Blank Inside for your personal message!