James Heal pilling tubes comply with ISO 12945-1 Textiles – determination of fabric propensity to pilling – part 1: Pilling box method. A certificate of conformity is also available.
The pilling tubes are packaged with a leaflet recommending that pilling tubes are replaced every 2 years, or after 5000 hours of use, whichever is the soonest.
Over time, the pilling tubes will become hard and brittle as they lose the plasticiser.
They are individually serial numbered to ensure that their usage is monitored.
They should be regularly inspected for signs of damage or wear and discarded before the recommendation if necessary.
A PDF version of this FAQ is available for reference.