After you have rolled your clay into a smooth, thin sheet, you use the cutter to press out and cut a rectangular shape to fit the size of your brass pen kit tube. You then wrap this clay sheet around your pen kit tube. Includes 5 cutters to match the most popular pen tube diameters: 7mm, 8mm, 3/8 in., 27/64 in. and 10mm. The cutter lengths are extra-long so they can be used with any tube length.

Polymer Clay Pen Starter Kit Instructions