Wooden Lead Pencils by STAEDTLER. Details:The formula is secret -- the pencil is world-famous. Staedtler's success story began over 180 years ago with manufacturing pencils. To this day, first-class manufacturing processes and sustainably sourced materials outstanding and consistent product quality. The Lumograph is available in a wide variety of soft and hard leads, for writing, drawing and sketching on paper, canvas, matte drafting film and more. Super bonded lead resists breaking while sharpening and drawing, both. Plus it wears evenly and erases cleanly. The Lumograph line is not only an ideal creative companion for drawing and sketching purposes, but drafters, engineers and even school age kids will benefit from the finest German manufacturing processes. Whether it's scientific or creative endeavors, in the home, office or classroom, Staedtler helps bring ideas to life.