Magnetic "C" Channel Label Holders, 3/4"x3",, Label Holder,Magnetic"C"Channel , 25 Holders / Pack Five standard widths are available. Standard lengths for each width are shown below. Standard product thickness is 1/16". Ample paper inserts are provided. Laser / Ink Jet compatible inserts are available. The unique "C" channel allows for easy barcode label scannability.