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These come in a variety of sizes, like 7cm x 2cm, 3.5cm, 5cm, or 13cm. They are coarse on one side (80 grit) and medium on the other (120 grit). Sanding can be considered to have 3 phases, shaping, smoothing (removing scratches from cutting or coarser sanding), and prepping for finishing/varnishing.

Generally speaking, coarser than 120 grit is for shaping, finer than 120 is for smoothing or taking out the scratches left by coarser grits or sawing. 220 or 320 are for final sanding in preparation to apply finish. 120 grit is a jack-of-all-trades and can be used for lighter shaping without leaving heavy scratches that will be tough to remove later. If you need to change the shape of the piece, use 80 grit; if you need to smooth it out, use 120.

A word of caution: more control is granted by the use of sandpaper stuck to a flat block with adhesive, rather than wrapping the paper around a block. The paper will tend to bulge at the edges, and the resulting “cut” will be uneven.

When sanding freehand or to sand curves, cut/tear and fold the paper like this; it will aquire the right rigidity, and there are no abrasive surfaces in contact with other abrasive surfaces, so the paper lasts longer. When one face is consumed, refold the paper.