Lathem Mechanical Time Clock Ribbon, Nylon, for Use with Lathem Series 2000, 3000 and 4000, Red/Blue (7-2CN) Ribbon comes packaged in a sealed plastic inner-liner to prevent the ribbon from drying out prior to opening Made from heavy-duty nylon Designed to work with many of Lathem's current and discontinued model time clocks including series 2000, 3000 and 4000 Ribbon Reversing Mechanism to extends the usable life of the ribbon Ribbon will work in the older model Latham 8000 series clocks, however the ribbon life will be shorter