Rather than bonding pieces of wood together in several stages, as in the case of traditional graphite and coloured pencils, pencils made from WOPEX are produced in a mould. Ideal for school and office use, the Staedtler Noris HB Pencil includes a convenient eraser tip for any corrections. Our Noris eco pencils are produced using a newly developed, innovative technology: WOPEX (Wood Pencil Extrusion). When the supply of natural graphite from Borrowdale ran short, the graphite was thinned down with other materials.

The STAEDTLER Noris digital combines the appeal and feel of a pencil with the technology of an S Pen stylus.

Looks like it relates to there being more than one system for classifying the pencil's grade and the note above that not all HB pencils are equal to each other. This answer is partly based on product information from Faber-Castell; thus, it may not be without bias. Thanks to WOPEX technology, these products can be produced in a more environmentally friendly and resource-conserving way. Finding what works best for your own artistic and writing needs is generally a matter of personal preference and experimentation with different brands of pencils.

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The red and black striped models from our traditional series offer comparable quality to our Noris pencils. A mixture of about 2 parts of graphite and 1 part of clay gives the usual HB or 2 1/2 degrees of hardness. The hardness of the graphite core is often marked on the pencil — look for a number (such as “2” “2-1/2” or “3”) — and the higher the number, the harder the writing core and the lighter the mark left on the paper. With their HB lead and eraser tip, these 3 graphite pencils are perfect for everyday use, in the office, at home or at school. H leads are extremely smudge-resistant and give cleaner lines, making them useful for things such as outlines, technical drawings, light sketches, and even watercolors.