Magnetic Label Holder 20x80mm . Our magnetic label holders are supplied from stock in pre-cut lengths but special sizes can be supplied on request. Each holder is supplied with white card inserts and a cover strip. Pre-printed inserts can also be supplied for each of the holders incorporating barcodes and location codes on request. . Magnetic are ideal for applications where regular changes are required, easier and quicker to move then adhesive backed holders. They are also suitable for use in cold stores. . Instant and highly visible identification.