Sony, Philips, TDK, Maxell - D60 - HF 90 - SQ 90 - CDit II 90 Blank audio cassette - Multiple models

This collection of blank audio cassettes includes notable brands such as Sony, Philips, TDK, and Maxell, featuring models like D60, HF 90, SQ 90, and CDit II 90. Blank audio cassettes were a primary medium for recording and playback of music and voice from the 1970s through the 1990s before digital formats became ubiquitous. Different models in such collections vary in tape length, bias settings, and intended use, affecting recording quality and fidelity. Enthusiasts and collectors value these cassettes for analog recording, tape art projects, or restoration of vintage media. The variety of brands highlights the competitive cassette market of the era, each with distinct tape formulations and durability characteristics.