These are quality Pilot refills for the Frixion marker pens that we have for sale. The Frixion pens have a rubber in the end to rub out excess marks on your work but also the ink is heat erased. This can be a blessing but also a curse when you mark your cutting or sewing line only to iron the work one last time. You soon get the hang of it.
Each packet of refills come with three refills in the packet so this is a very cost effective way of marking all your sewlines, cut lines and marks for other fabric works such as embroidery and dressmaking.