Thumb Writer (small)

This popular secret mentalist accessory lets you secretly write things inn full view of your audience.

Thumb Tip writer version of the Swami device.  This version has the lead built into a thumb tip.  Some mentalists prefer this version to the under-nail writer, because it is more secure on the hand when the dirty work is done.  It does have the drawback of not being a completely invisible gimmick like the under-nail version.

But lay audiences never see a thumb tip anyway, so this drawback is minimal in my opinion.

Small version for smaller hands