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The gauge starts at the lowest gauge number of 5Ø or 00000, corresponding to the largest size of " () to the highest gauge number of 36, corresponding to the smallest size of " (). Size steps between gauges range from " between high gauge numbers to " between the two lowest gauge numbers and do not correspond to a particular mathematical pattern, although for the most part the steps get smaller with increasing gauge number.  Concerning wire and fine tubing, the gauge number is used to specify the outside diameter of the product, whereas for larger mechanical tubing the gauge number specifies the wall thickness independent of the overall size of the tube.
Gauge Triangle – very fine-for surface finishing work
40 Gauge Triangle – fine-for surface finishing work
38 Gauge Star – less surface area than standard, with an extra corner of barbs, for quicker felting-for shaping a piece and attaching pieces together
38 Gauge Triangle – standard-for shaping a piece, for shaping a piece and attaching pieces together
36 Gauge Triangle – medium-for shaping a piece, pushes chunks of wool
36 Gauge Crown Tip – one barb on each corner set 1/8″ from the tip, for shallow surface work
Reverse needle – pulls the wool out instead of pushing it in. This needle is good for blending colors or inserting special hair (like mohair) into a felted piece.