P610840 Prym Cartridge Pen. This pen is suitable for marking seams and patchwork. In particular, relatively fine and accurate work with stencils. It is shaped to sit comfortably in the hand and its fine white or coloured cartridge guarantees accurate tracing of markings and pattens onto light-coloured and dark fabrics. There is an eraser cartridge on the upper end of the pen to reduce markings. When washed, the markings disappear completely. The white and coloured refill cartridges and the eraser cartridges can be ordered and replaced. 610840 wh 1pc