remove the white foil covering the adhesive side and attach the disc with firm pressure all over (eg with flat or clenched hand covering the entire disc with even pressure)

To address this concern

Can not be used on magnetic glass boards

And the AlNiCo products are made for experiments and teaching

The magnets are made of flexible magnetic foil

Affaldssortering “fyrværkeri” - magnetskilt 30x30 cm. Auto-translated (EN) remove the white foil coveringIf you are dealing with fireworks at a factory, selling fireworks at a store or run a recycling station, this magnetic sign is perfect for you for sorting waste firework parts. This is the fireworks pictogram from the official hazardous waste pictogram series for waste sorting, printed on strong magnetic foil with UV ink. A strong magnetic sign that resists both wind and weather + the sun's rays for a long time without fading. We will translate the