This is the 3D Bouncy Ball and it is super duper easy !
Your material need are:
*As many of loom bands as you can.
*1 Monster Tail (if you don't have a monster tail loom you can use your rainbow loom instead).
*1 Rainbow Loom Hook or a crochet hook.
To make a rainbow loom 3D Bouncy ball, search for a tutorial on the web link here.