Reusable label holders: the data cardholders are soft, they can be easily applied or moved to metal surfaces and repeatedly applied because of the magnet back Quick labeling: write on the included paper strip, 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 adhesive labels Simple style: the magnetic holders are in simple black and white color, fit offices, workshops and daily , the protective film is transparent and clean to keep on labels and clean for a long time Applicable size: the magnetic data cardholders are 3 inches/ 7.62 cm in length and 1 inch/ 2.5 cm in width, very handy for working or studying, can be applied to many occasions, producing much convenience in your work or life Material:Rubber soft magnetic colour:Black + White Package Contents: 50 x magnetic label holders 50 x protective films 100 x replacement paper strips Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.