LOONBALLOON Trout Fish Fishing Fisherman Rainbow Shiny Scales Party 29in. Mylar Balloon, Holographic Shape. Accent your fishing themed party with this 29in. large unique shape Rainbow Trout foil mylar balloon. The perfect balloon for your fishing party, this 29in. 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. 29in. Rainbow Trout Foil Mylar Balloon