Honestly, I am not sure if they are oil based. These are the regular fine point permanent ink sharpie pens. I have used some of them for labeling, drawing, writing, etc and my sister uses them to do math and art. If you would like a bulk auction please let me know and I can do that.
You are welcome :) I am glad someone else can use them! I have a ton more to list so if you would be interested in an auction with more than 8-10 just let me know how many and I will put one up in addition to this one. Thanks for checking out my auctions!