Our Copic refill service is now over so we are selling the remaining refill colors on a first come, first serve basis. Remember, the refills are alcohol ink, so you can use them just like you would Ranger brand alcohol ink. You don't have to use them just for refilling your markers. I love using them on Yupo paper. They are priced depending on how much ink is left in them, so it is a great opportunity to get a nice assortment of colors.