This Thomas the Tank Engine Happy Birthday Foil Balloon is an ideal way to add a festive touch to your birthday celebration! It measures 18 inches and is two-sided. It is made by Anagram International and is self-sealing, making it easy to use. The bright and colorful design will be sure to be a hit with any Thomas the Tank Engine fan. The balloon is an easy way to make your birthday celebration extra special and will be sure to be a talking point for many years to come!