What are the different size specimen cutters used for?

The range of cutters available from James Heal are:

Examples of use:

230/100
Normally referred to as the 100cm² cutter.
The number refers to the area and is normally used for creating specimens for calculating the weight of the sample in g/m².

230/38
Normally referred to as the 38mm cutter.
The number refers to the diameter and is used for cutting out specimens and foam for the Martindale sample holder.

230/140
Normally referred to as the 140mm cutter.
The number refers to the diameter and is used for cutting out SM25, felt or other materials for the Martindale abrading table, or for the pilling specimens on Martindale.
This cutter is also used to calculate the mass (g/m²) for woven felt as the specimens are retained for use on the laboratory Martindale instruments.