Touchwood sounds a lot like the name of an episode of Beavis & Butthead. This is actually a set of stickers for the superstitious among you. If you are the sort that says, “Knock on wood” a lot and really means it you need an $8 set of these.
You get three stickers in the pack with one round, one square, and one rectangle. They are all self-adhesive on the back with real wood on the front. The idea is you can stick them to your phone or other device and then have wood to knock on when you need to.
The name of the company selling these in the UK is Suck UK. That also sounds like an episode of that old cartoon. Apparently they don’t ship to the US at this time.