Vintage High-Bias Cobalt C-17 Audio Cassettes in a clear Hi-Def Anti-Resonance Cassette Shell, chrome notch, tabs in, with an independant bridge to minimize resonances. C-0 made in the USA by Shape Co., the audio tape is most likely Maxell XL-II or XL-IIS, able to handle +5 recording levels and with very low tape hiss.
The cassettes are slightly scuffed and scratched.