Nikons are what I have. There are three of those things. I bought them on eBay still in the original box and they look like they have never been used. But there weren't any instructions in the box. They are the original Nikon magnets and very strong. So they have sat for about a year now. As soon as I can take the bandage off my back from the last set of injections (to the facets) that didn't work, I'll be trying them for awhile. Thanks Brian and Bob for the help.

It would be nice if I could get one area to quit hurting.

Billye