The price is per

And careless use on glass boards can easily damage the glass

but you can't hang it as a magnet

Cannot be used on magnetic glass boards - not strong enough

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UNI Chalk Marker, Lilla XL (8,0 mm.) Auto-translated (EN) The price is perPurple chalk marker from UNI for smooth surfaces. Please note: This is the large broad tip PWE 8K model. Colour: Purple. Content: Chalk, water and colour. Nib size: approx. 8 mm. UNI Chalkmarkers PWE 8K are suitable for the following surfaces: Blackboards (incl. blackboard paint), windows, glass boards and plastic. Shake well before use. A chalk marker is liquid chalk (chalk, water and colour). In addition to looking great on the board, chalk markers