black and white (one of each colour)

Buy one (1) ring magnet or more

math on blackboards (subtraction) etc

The pen has a strong magnet at the tip

Magnetark A4, Gult engros black and white (one ofA4 yellow magnetic foil. Magnetic sheets are not suitable for glass boards! High quality magnetic sheets. Cut it to the desired shape and size with regular scissors. Size: 21 cm x 30 cm (A4) Thickness: 1 mm. Strength: approx. 80 gr per sq. cm. Colour: strong yellow. Use it e. g. to make signs for the whiteboard or magnetic pieces for notes for the fridge. There are countless options. Magnetic sheets adhere to all magnetic surfaces, except glass