Discount Magnet features a C-Channel Magnetic Data Card Holder Roll that firmly hold labels in place and stick to any magnetic receptive surface. Create new shelf labels without the sticky adhesive mess. Our card holders are ideal for product labels, barcode labels, shelf labels and more for warehouses and offices that use metal racks and shelves. Rolls of c-channel data card holder magnets allow you to customize the length of your labels to fit any project easily with sharp scissors. Choose from 1″ wide rolls, 2″ wide rolls, and 3″ wide rolls in 25′, 50 or 100′ rolls.