How to make-a-Rubber-Band-Ball

There are many great reasons to have a rubber band ball. You can bounce it, use it to keep all your rubber bands in once place, or squeeze it to strengthen your hand muscles. If you enjoy making your first one, this might even become a hobby.

Create a core. You can start with any small object, such as a marble or golf ball. A "true" rubber band ball, however, includes no other materials. Here's how to get it started
Select a short, thick rubber band, such as a band used to secure vegetables.China Custom Rubber Grommets
Fold this rubber band in half, then in half again, then a third time if possible. Do not twist it; you should end up with a flat "stack" of rubber.
While pinching the thick band flat, wrap a thinner rubber band around it.
Twist the slack of the thinner band and wrap it over the thick one in the other direction.
Continue to twist and wrap until there is no more slack in the thin band.

Wrap rubber bands around the core. Start with two rubber bands placed in a criss-cross shape over the core. Make sure they're tightly secured. You may have to twist and wrap them around the core a few times.
Start with the smallest bands first, since they won't be useful once your ball passes a certain size.
Add more rubber bands until the ball is smooth. Keep wrapping rubber bands so that you form a ball. Space the rubber bands evenly so that no one side of the ball is larger than any other. A ball without an object in the core will start out lumpy, but it should become smooth by the time it reaches the size of a golf ball