Super Hi-Polymer Lead produces crisp lines of consistent darkness, smoothness & density in 0.9mm automatic pencils. HB hardness is equivalent to a No. 2 pencil, & is excellent for all general writing, including items to be faxed, photocopied & electronically scanned. 0.9mm thick lead is perfect for young writers & first-time users of automatic pencils. Each super-strong lead writes as far as an entire wooden pencil & produces a dark line. A 30-piece tube is equivalent to 30 wooden pencils.