Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's a china marker

I like these. It does the stuff you expect a china marker to do, which is make marks on just about anything. I'm perhaps slightly odd: I sharpen mine with a pencil sharpener. (Use an "art" pencil sharpener, takes a fatter pencil, and has a cone with a larger angle). They do not take a point as well as I'd like, nor as well as some others I've had, but it's good enough.