It is now compulsory to wear a mask in shops and other enclosed public spaces in Northern Ireland.
The decision was taken by ministers last week as part of efforts to suppress coronavirus. Infections in NI have risen three-fold since early July.
Stormont said it wanted enforcement to be light-touch but warned fines of up to £60 were possible.
There are exemptions including for staff in shops, children under 13 and those with an illness or impairment.
Autins Group plc (LON:AUTG) is an industry-leading designer, manufacturer and supplier of acoustic and thermal insulation solutions for the automotive industry and other sectors.