Thanks for looking at our selection of Montana Paint & Ink Pens , the description for this product will follow along shortly. in the meantime, if you find yourself with a question about this product, anything at all, like materials or sizing or just plain old anything please use the contact form to speak to us, we answer all emails within the hour during office hours, or even just live chat us. If you don\'t find what you are looking for with this piece of Montana Paint & Ink Pens then you really should browse the rest of the website, we have a pretty good selection of clothing, footwear, accessories, and a few other selections of interest. A 25ml empty refill bottle for your Montana gold Acrylic paint, its great for mixing up colors when working on a piece. The refill bottle gives you the flexibility of having a spare bottle at hand to fill up your fine or extra fine marker pens.