This is a spare pen point for STAEDTLER Mars Matic technical pen. Staedtler technical pens are an excellent choice for drawing with ink on a drawing board and drawing paper for drafting technicians, architects, cartographers and artists all rely on high-quality technical pens for professional drawing and design work. In the past, drawing pens were used to draw with ink. However, modern technical pens with hard chrome drafting tubes enable you to achieve maximum precision.