Audio cassette cases with a clear front and opaque metallic gold (PMS 871C) back. These cases have square corners.

Brand new, vintage-style, high quality professional cases. 

The inside dimensions are around 103 x 85 x 14mm.
Outside measurements: 69.6mm x 109mm x 16.8mm (2.74" x 4.29" x 0.66")
Weight: 30 grams