Oavii Sports ball

I love this thing. It's quite unassuming just looking at it, but it's a heck of a workout. I make medieval armor as a hobby so my grip strength is pretty good. After 5 minutes with this thing, I knew exactly which muscles I have not been using. A friend had the string start version which is were I learned about this little gyro centrifugal gadget. I got the auto start version and it's definitely worth the few extra bucks. No worrying about loosing the string and the startup speed from the spring is double that of what you can achieve with the string with less hassle. As for the construction, the core has been machine balanced and the ratchet mechanism is all metal for a long life. They also make a higher end version that's double the pounds of resistance. Definitely a future purchase. I would recommend starting with this one unless you are a body builder.

Love this product! The auto winder is worth the price, so much easier to get rolling than the string version. The string version I had to try about 6 times before I could get in the swing of it. First time out of the box, success! I am coming back from hand, wrist and forearm damage from a fall. I am a musician not a weight lifter. This is working those long dormant muscles in a gentle but effective way. I feel it after about a minute and since I control the force, I am not hurting myself. The flashing lights are fun and as a side bonus, the cat loves it too.

These are worth the money! After trying the cheaper, string-wound spinners, which ultimately were WEAKER in their resistance and a pain to string-up, I watched several Youtube videos and decided to spend the money on something I'd truly find to be a good quality Spinner. This is it! Not only with an easy, auto-start mechanism, but the resistance builds as high as I can go with my strength, and I love the flashing light colors. I did have 1 that stopped working after a short period of time (1 month from purchase), but so far the replacement is working fine (after 2 months of purchase).