Supplies for Postage Meters are very precise and at Whitaker Brothers, you can trust us to help you find exactly what you need. Although they require ink cartridges, they aren’t ordinary cartridges. These thermal ink cartridges come complete with a microchip that detects when postage has been stamped. Because it is like currency, it is important for every stamp to show up on the envelope. Pinwheel tapes are available as well.