Under specified pressures, the YG401 Series Martindale Abrasion and Pilling Machine (Plus) is used to test the abrasion resistance of wool and wool mix woven textiles, knitted fabrics, and nonwovens. Under low pressure, it is also used to test the pilling properties of most textiles (particularly woolen woven fabrics). It was intended to provide a regulated amount of multi-directional abrasion between the fabric surface and a crossbred wool abrading cloth at low pressure until thread breakage or an undesirable change in color or appearance occurred.