Barcode Specifications: 6 Human readable characters. Vertical characters Helvetica font. First three characters must be alpha CLN, black on white. Second three characters, any combination od A-Z or 0-9 black on white. Polyester label stock. Barcode 3 of 9. Tape Library: ADIC, Compaq, Overland, Qualstar, Spectra Logic Quantity Per Sheet: 45