NEW: The only Construction Marker with effective dust and moisture protection Push-button as umbrella cap and barrel with sealing ring for maximum all-round protection against external influences. NEW: Reliable hold in the long term Its new “Power Lock” mechanism inside is a milestone in the development: The duration of the lead holding power has been tripled The longevity of the product once more has been noticeably improved Unique: “LONGLIFE CAP” with extra strong clip and robust sharpener for long term use https://youtu.be/OSSQ3i0eFQI?list=TLGGGsv6-Vd4dYIwMTEyMjAyMg