Celebrate your alien themed party with these 11 inch round Alien - Deluxe Key Lime Green printed latex balloons. The perfect balloons for your alien party, these 11 inch Sempertex party balloons are great for setting the scene! Mix these with a selection of our alien foil mylar balloons for the perfect balloon bouquet clusters. The balloons can be inflated with helium to float or with a balloon air inflator to hang around the party area like a balloon arch garland. Balloons arrive uninflated.