NSD Thumb-Wind Start Spinner – Gyroscopic Wrist Exerciser

It's a compact exercise tool that you can use for your arms and shoulders. The auto-start (aka pull back or wind up) it's hugely useful - way better than a pull cord. The drawbacks: That NSD doesn't have exercises for the spinner on their website. That changing over sides is kind of hard (but I'm getting used to it). Taking off a star for the lack of exercises for customers.