12Pack Fridge Magnets for Whiteboard Strong Refrigerator Magnets for Adults Small Push Pin Magnets for Office Classroom Locker Whiteboard Fridge Silver

Specification: One metal magnet can hold up to 12 pieces of A4 paper Color: Silver Quantity: Set of 12 You Must Know Please keep in mind that magnets do not stick to non-metal materials such as wood, glass, plastic, textile, concrete, etc. However, many non-metal surfaces may have metallic properties, so these magnets will stick to them. Magnets are only as strong as the surface you're trying to attach them to. Some metal won't hold any magnet, or won't hold it well if it has a low iron content. (Many varieties of stainless steel, for example, only weakly hold a magnet; some do not at all.)  Other factors, like thickness, surface texture, and paint, all affect the magnetic gripping properties of metal. And the position is important too. Magnets grip their strongest when the pull force is perpendicular to their surface, thus vertical holding force (due to gravity) is only a third of their rated, horizontal gripping force. The easiest way, therefore, to disengage a magnet from a surface (or another magnet), is to use leverage: Tilt the pin toward one of its sides, rather than pulling straight away (i.e. 90° from the metal surface).o use and can hold up heavy construction paper and Calendars WARNING: 1. Notice! They Don't work on the glass whiteboard. 2. Do not use magnetic push pins to hold heavy or valuable items, as they may not provide sufficient holding strength. 3. Cause they are not toys, please keep them away from kids or pets, as they can be a choking hazard if swallowed.