Ribbons and keys bundle. Includes two compatible ink cartridges and two keys for the following Pyramid time clock models: 3000, 3000HD, 3500, 3500ss, 3500HD, 3700, 3700HD, 4000, 4000HD. Black ink, long life, premium quality better than OEM, direct replacement for Pyramid 4000R and 41479K. Not compatible with Allied Time AT-3500 model.