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. These 25ml acrylic paints are made to match the colours of the Montana Gold spray paint range. They are water and abrasion proof and can be used in any empty pen, mixed with other colours (to achieve your ideal shade) and can be used on almost every surface. These paints can also be applied with a paintbursh or airbrush also. Gravel