INK SACS FOR WAHL METAL PENS Inks Sacs should be fixed to the sac peg with shellac and dusted with Pure French Chalk. Choose the Sac size to fit your pen Just click the ruler top left corner for a list of models and sac sizes. (N) = Necked Sac (T) = Tapered Sac (NT) = Necked and Tapered Sac