A tape cassette that includes a box-like housing having a front wall, a top surface and a bottom surface, a wound tape mounted within the housing, a tape guide, and an indicator of the tape type formed in the front wall. The housing directs the tape along a path to an exit, and at least a portion of the path extends parallel to the front wall. The tape guide is spaced downstream of the exit, whereby a section of tape is exposed between the exit and the tape guide. The indicator is formed in the front wall proximal to the exposed section of tape, and includes at least one aperture that extends generally parallel to the top and bottom surfaces and perpendicular to the portion of the path extending parallel to the front wall.