Fun Birthday Balloon for outside.
We used an air pump to inflate; unless you have remarkable lung capacity, I don't recommend trying to blow it<br />up using your mouth.  The material was durable and it served it's purpose.  I didn't use on a mailbox but rather a porch rail and added some tape to secure it upright.  It was what we needed considering I didn't want to try to find a balloon store open in the pandemic.
Rating: 4 stars