Does anyone know where I can buy a thin card magnet which covers the entire face of a card? I have only seen the circular ones. I have experimented with the flexible magnetic strips but these are not strong enough. Any ideas??

If it's for use with something like the M5, you could just glue cards together with that piece of foil they send you (I'm not sure what kind it is). Unless you want it to flip or something.

Should the card magnet be invisible to the spectators eye, or will they just not see it through handling?

A magnet that thin, commercially available, probably won't be too strong

Thanks guys any ideas where I can obtain such a magnet?

You can buy magnetic sheeting at office supply stores and hobby stores. This stuff can be printed upon with an ink jet printer. Don't use it in your laser printer.

Check Hobby Lobby. I saw some there yesterday.

It is about twice as thick as a playing card.

Bill,

Spending your late years lurking in craft shops, eh?

Staples and Office Depot both sell the 8 1/2" x 11" magnetic sheets...check the area where they sell inkjet labels.

Craig

Domino's the pizza shop. with those magnets for your refrigerators

That's a fact! I made magnetic cards using different sorts of rubber/sheet-magnets. Not even strong enough to pick up a paperclip AND to hold it securely.

That's why I use (for the cards I sell) 2 neodymium magnets; as thin as possible (0.6 mm = 0.023"). These cards work. And due to the way of making them - there are no obvious bulges to see.