Designed for all sorts of uses: 
-Keep track of which bottles are whose on your group wine tours
-Put your name on your glass at a get together
-Make notes and drink-by dates on your bottles in the cellar
-Marking glassware for side-by-side sips
-Writing sentimental or funny notes on bottles you plan to gift

Easily washes off of glass with warm water and polishing cloth.
*1 pen