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Shorty/Wood Mechanical Pencil Leads
Packaged in a tube of four leads, the Shorty/Wood refills are available in eight colours. Each lead is 3.15 mm thick. The soft 7B graphite lead can write on almost all materials, including wood, metal, paper and plastic. The red lead can write on glass; the white lead can write on radiographs. The leads automatically wear to a conical shape as they write. Thus, sharpening the Shorty leads is unnecessary.
$3