Wide application: the magnetic holders are in simple black and white color, fit offices, workshops and daily use, the protective film is transparent and clean to keep text on labels bright and clean for a long timeEasy to use: write on the included paper strip, slide in the paper insert and the transparent protective film, stick the magnetic label holder to clean and flat surface, saving time and making reposition easier compared with traditional adhesive labelsMultiple sizes: There are four different sizes of magnetic data cardholders , including: 1 x 2 Inch / 2.5 x 5cm, 1 x 3 Inch / 2.5 x 7.62cm, 0.8 x 3 Inch / 2 x 7.62cm, 2 x 5.5 Inch / 5 x 14cm, very handy for working or studying, can be applied to many occasions, producing much convenience in your work or lifeMaterial: these magnetic labels is composed of flexible c-channel magnets with full rubber magnet backing, label paper and plastic film can be insert into the magnetic card holder easily and can apply to any metal surface and change label easily