OEM ribbon cartridge from the manufacturer, not an imitation. 5-year+ shelf life. 1-Dozen Black/Red Calculator Ribbon Cartridges for Monroe Calculator Models: 8130, 8145, 7130, 7140, 7150*, 5130, 5140, Classic, PRO, and Ultimate Extremely Convenient Installation of Ribbons for Monroe Calculator Models Offers Monroe’s Exclusive True Red Color with Heaviest Inking Saturation on the Market Superior replacement option for ERC02BR Black-Red POS Ribbon, Nu-kote Model BR106N, NuKBR106N, Dataproducts R2087 DPSR2087, and Victor 7011 ribbon cartridges