Strength magnets: Holding force depends on the surface structure. Useful practical thing as magnets for bulletin board or magnets fridge for fridge organization|Strong Magnets: These magnetic pins can hold A4 papers. It will be easier to use these magnets and remove them from the board. Not suitable for glass magnetic board|Magnetic needles for bulletin boards or magnets for magnetic boards are useful accessories in teaching materials office use arts and crafts and home improvement. The best part is it doesn't leave holes on your magnetic surface|ABOUT SHI:Due to the different monitor and light effect the actual color of the item might be slightly different from the color showed on the pictures.|No Scratches on the surfaces: These handy magnets work well on file cabinets or metal presentation boardsthey can hold several A4 sheets of paper at a time