HPs Custom Labeled Data Cartridges allow customers to place a custom order with HP & specifically define the exact barcode sequence printed on each label. Customers should expect a longer lead-time for custom order processing. HPs Non-Custom Labeled Data Cartridges allow customers to receive labeled data cartridges fast because no customization process is required. These products are perfect for customers that require labeled media but do not need to define the exact sequence printed on each label. Each HP Non-Custom Labeled Data Cartridge has a unique, pre-defined barcode sequence printed on each label (no duplicate codes).