Diary of a Wimpy Kid Happy Birthday Balloons 12 pieces (1) 39" Diary of a Wimpy Kid SuperShape XL; (2) 17" Diary of a Wimpy Kid Mylar; (9) 11" Latex Balloons - (3-black, 3-yellow, 3-blue) Total 12 pieces. Balloons will arrive not inflated and you can be filled with air or helium. MYLAR balloons are double sided and self sealing.