The Tajima Raku Tsubo B is a Japanese chalk line designed for heavy-duty chalk line marking with sumi ink. Thanks to its large 60 ml reservoir and airtight lid, the ink dries less quickly and remains ready for use for long periods.

This model incorporates several systems designed to improve fluidity and durability on the job site: an automatic brake that slows the return of the hook near the hand, an anti-reverse mechanism that protects the internal spring, and a practical thread guide that facilitates thread replacement. Its absorbent cotton ensures even ink distribution for clean and regular lines.