Cassette tape by GPO Retro, Add-to-bag potential: considerable, Blank C-90 cassette tape, Record up to 90 minutes. Get your daily dose of nostalgia with one of GPO Retros classic tech designs. From radios and turntables to speakers and CD and cassette players (remember those?), the brands authentic gadgets help add a splash of colour to your home. Plus, they sound great, too win, win.