ZEBRA Check Pen α, set of 2 (blue). One is unused, and the other has been used to mark about 5 lines with the thicker side. Purchased on Amazon this August. I've decided that the study method using check pens doesn't suit me, so I'm offering them to someone who needs them. One is unused, but the other is a slightly used item, so please refrain from purchasing if you are concerned about minor details.