Sign pens which can write on a variety of clear surfaces including glass. The ink is easy to wipe off with rags or water. Available in individual pieces or in a set of assorted colours.
可以在包括玻璃在内的各种透明表面上写字的签字笔。墨水很容易用抹布或水擦掉。有单件或多种颜色可供选择。