LOONBALLOON Music Balloons, 18 inch ROCKSTAR – ROCK ON GUITAR, 3 Gold Latex Set, Accent your music themed party with this 18in. round Rockstar – Rock On foil mylar balloon. The perfect balloon for your music party, this 18in. party balloon is great for setting the scene! This balloon includes a self-sealing valve, preventing the gas from escaping after it’s inflated. The balloon can be inflated with helium to float or with a balloon air inflator. Balloon arrives uninflated. Rockstar – Rock On Foil Mylar Balloon 18in.