Super Sharpie

Imagine asking a spectator to think of any number. You write a prediction on the back of your business card. When they say their number, you turn over your card and it matches

There's  isn't much more to say about the Super Sharpie by MagicSmith other than it is a regular Sharpie with a built-in gimmick.  You can write with it like a regular Sharpie so you can use it for your "signed ___" effects . If it runs out of ink, it can be refilled.

You get the gimmicked Super Sharpie and a 15-20 minute video.

The gimmick is cleverly concealed and works well. One thing that you should be careful about is the noise the gimmick makes while using it. But that shouldn't be an issue unless you perform in quiet locations.

If you always carry a sharpie and do mentalism then you probably already have one of these.  If not, you should get a Super Sharpie.

I believe MagicSmith also has a mini SuperSharpie available