I know you have a lot of questions about this amazing pen, you maybe thinking “what the hell does the glass pen do? There’s no black ink or anything!” Welllll you can buy it off at Amazon and you gotta buy a black ink, color inks, and maybe a glow ink, not one of those inks where you have to put under the light, that’s a bad idea. You have to get the other ink which you have to get a UV light that glows dark. If you have special glasses or maybe something you could see the light, but hey this is your chance to get this glass pen. It’s on Amazon and their selling it now and I am not too sure if the sale is on 10 or 15% off. It’s 7 dollars I think, I am not too sure but it’s very cheep. Remember, don’t break the glass pen, or it’s gonna be a waste. And yes I am using this tool for drawing and the ridges and edges, including types of figures and characters, that’s all I want to say to give you guys to look at the glass pen.