Floral Mum Balloon Boxes. Includes: 3 boxes (Size: 30x30cm), 12 Balloons and 3 Adhesive letters. It’s all about number one: Mum! Celebrate the special one in your life with these eye-catching balloon blocks, perfect for celebrations, birthdays, mother’s day and displays. The blocks feature clear plastic windows and come with adhesive ‘Mum’ stickers and an balloons.