My tape is called NexCare (by 3M) and I bought it at WalMart about a year ago.

This is it:
http://www.walgreens.com/store/catal..._sku=sku727919

Mine is in a plastic dispenser like Scotch Tape comes with a little sharpey cutter at the tear off spot. It is clear plastic with tiny holes so it is breathable.

Tape can be fraught with woes. I don't wear my magnets all the time. I go in bursts of 3 days to a week, then I don't need them for a while. So my tape lasts me a long time. Sometimes I just lie on my back with a loose mag underneath me, while I read before sleeping. These really strong large ones really don't need long times on the body, at least not for me. When I do my left groin area, where I tore that tendon, I don't use tape at all, just lie on my side for an hour and read with it in the fold of my leg. (I don't have TV in the bedroom). You could watch TV etc and place them like that.

I just ordered 50 of the 1/2 inch wide 1/16 deep from Ebay for 11.69. I am going to sew those into a large long pad, to put in the bed. And a smaller pad for 2 of the big ones. My friend just came by on Sunday, and gave me a quilted gift pad for a gift.
So we discussed how to do this, and she may help me, as she is more skilled at sewing than I am.

The tape sort of "gets" to me after a while...it leaves a residue, that is hard to get off, etc, and for really hard places I can't reach well to apply it. I find that body heat makes it stick really well. So if it seems "unsticky" at first on your back just lie on it for 15 minutes and the stickum then really sticks! We have a memory foam mattress topper that reflects back body heat, and this may enable this more, I think.