A 4 pack of birthday greeting mylar smash balloons. These look like they are the round variety, and approximately 3”. Without opening an exact measurement is difficult to share. They are not helium filled, so do not float. They are self inflating when smashed as outer package releases gradually. For a SMASHING good time, hit them between your hands or place on the floor and stomp them! New pack, never opened. 4 different styles. Great to use in place of a traditional card, including a “To” and “From” lines! I have used variations of these in classrooms for special birthday students, and included them in box presents sent via mail for long distance friends or family. Something fun, something different 💥