Beer Can with Lip Wrapper

Grupo Cerveza Alhambra is advertising its new beer can design featuring this "lip wrapper" made of tin.

I've never seen one of these things, though I suppose they may have been around in Spain where Alhambra is brewed. The brewer says this is supposed to keep the lip clean, so that you can enjoy both alcohol and good health.

So what is this thing supposed to be called? Lip Wrapper? Can Cover?

From Strange New Products