Experience permanent writing and marking results with the Faber-Castell Document Pencils. These indelible pencils are packaged in a box of 12 and provide the highest-quality document-proof results. The Castell indelible pencil includes 12 indelible pencils in blue (ST51). These copying pencils offer an ideal solution for permanent applications. The Faber-Castell indelible pencil is qualified for checks, certificates, contracts, medical, dental, orthopedics, orthodontics, and more. Faber-Castell document pencils feature a break-resistant lead that is glued the entire length of the copying pencil to ensure limitless writing and marking, excellent point retention, and guaranteed easy sharpening. The Faber-Castell indelible pencil is proudly produced using reforested wood from certified sustainable forests. Faber-Castell copying pencils are made in Germany and feature an environment-friendly, water-based varnish. Since 1761, Faber-Castell has proudly produced quality writing tools for various applications. Faber-Castell indelible pencils provide a durable, quality tool for office, medical and other permanent applications