IKEA marker pen set of 6 colors. One end is a stamp, and the other end is a regular pen. The stamp patterns differ depending on the color. These are old, so I don't know the details, but they've hardly been used, and I think there's plenty of ink left. It looks like water-based ink, but as stated in the instructions, it contains a lot of pigment and seems to be ink that doesn't wash off. *Instant purchase OK #IKEA #marker #pen #waterbasedpen #stamp #MoraPen