Equipped with a graphite lead for marking and writing on all material surfaces. The interchangeable special pencil is also suitable for dusty, rough, oily, and wet surfaces. It can be wiped off smooth surfaces. It features an automatic lead guide in a stainless steel tube and is extremely durable due to high-quality craftsmanship. It includes a fail-safe and easy-to-grip protection for the lead with a special holding clip, as well as an integrated lead sharpener in the protection.