Perfect for special events: 10th Birthday, 13th Birthday, 16th Birthday, 21st Birthday Bash, Special Anniversaries, etc. Material: Foil (Gold Finish) Size: Height: 40cm (approximately 16 inches), Width: 20 cm- 40 cm (depends on the Number). To inflate the balloon, just simply fill it with air (the simplest way is to blow with your mouth or use a balloon pump). You can also use a straw to blow the balloon. A small 16-inch Number balloon can be decorated by sticking it onto the wall using double-sided tape/masking tape. All alphabets available: 0-9. Choose the numbers of your choice. Balloons is sent in flat packaging without air inflation. The balloon string is not provided.Disclaimer: Product photos are for illustrative purposes only. Actual colors may vary from the product photos, and may also vary from the PC/Mobile/Tablet?s screen due to monitor color restrictions. Important Notes: 1) Do not over-inflate/over-pump the balloon(s). Inflate balloon(s) with appropriate amount of air to prevent it from bursting. To inflate the balloon, you can use a balloon pump or blow it with normal air. 2) The balloon(s) is reusable. To deflate the balloon, insert a straw to the opening (red plastic strip) of the balloon deep enough to let the air out. Meanwhile, gently press the balloon to deflate it.