It is fun to stretch out Joyfy colorful springs and then snap back. Or hold one end of the slinky toy and let it fall by the gravity. You will love the feeling similar as the bungee jumping. This is a good way to wind down! You can use the spring anytime and any place you want as it is compact and portable. You will get 30 pcs rainbow springs (1.4" high each, 9 different designs), meeting your demands for party favors, goody bag fillers, birthday gifts, pinata stuffers.