Koosh Flingshot Set for Kids - Bundle with 3 Slingshots Outdoor Toys for Boys, Girls Plus Stickers, More | Koosh Ball Party Favors Set. This funny little Koosh bundle includes 3 vibrant colored Koosh slingshots with launchers for all time outdoor fun. Why is it named Koosh? These Koosh Flingshots are so aptly named after the sound they made when the Koosh Balls land. Use these Koosh Flingshots for a fun surprise in your kid's party favors, as outdoor activities at your child's upcoming birthday party, or have them be unforgettable Koosh goodie bag fillers. This officially licensed Koosh slingshot set is sure to be a hit with all young kids, boys and girls alike. Set also includes sports stickers and a Rex-Man door hanger.