Materials
Sanding
The stage after rough shaping in pipe making, where the body and mouthpiece are smoothed with progressively finer sandpaper grits; it takes up the largest share of workshop time.
Sanding is the process by which a pipe body, once out of rough shaping, is worked through progressively finer grits until it reaches its final surface. However unglamorous it may look, this step takes up the largest share of time spent in the workshop. It's not just a polishing prep either: how finely the surface is worked directly determines how much the briar grain will read afterward.
Grit Numbering Systems
Sandpaper grit numbers aren't universal. On the FEPA (ISO 6344) scale common in Europe, the number is preceded by the letter "P"; on the CAMI scale used in North America, that letter is absent. The two systems give fairly close results at coarse grits but diverge noticeably at fine ones. Because of this, sequences described in different sources can't be compared one-to-one; the "600" grit paper one maker names may correspond to quite a different particle size on another scale.
Building the Sequence
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Source: Pipedia, adapted under the CC BY-SA licence.