500 Pack Magreen Black Magnetic Push PinsUseful as Fridge or Kitchen Magnets, Cool Multi use Industrial Strength Office Dry Erase Whiteboard Magnets Color: Black Baking Finish Material: Metal Brand: Magreen About this item [STRONG MAGNETS] The material of magnets is neodymium. These metal brushed nickel magnetic tacks reliably hold up to 20 sheets of printer paper with a single magnet. Don't work on the glass whiteboard. [SMART DESIGN] The refrigerator magnets will not ruin walls and poke