It’s the funniest activity for your boys ever! And the easiest too, so this craft has many advantages. The supplies needed are 2″ diameter PVC pipes. Two inches is a good size cause it fits ping pong balls, golf balls and matchbox cars. The elbow is fun because it makes the balls and cars “jump” at the end of the chute. You and your kids can talk about how fast various kinds of balls travel, change the angle of the chute to see how that impacts movement. So if you and your kids need to stay at home, now you can play in this indoor game!