Colorful board markers. Uses water-based ink with Pentel Sign Pens. Ink is adjusted by knocking the back of the pen. These are extras, so I'm offering them to anyone who can use them. I bought them several years ago and have kept them at home, so I haven't checked the ink in the unused ones with the film still on. - Colors: Blue, Red, Green - Quantity: 10 pens (2 pens have lost their form, so I'll include them as a bonus) - Type: Board marker - Brand: Pentel - Model: Sign Pen - Ink Type: Water-based ink Thank you for looking.