This is a two-pack of Sony Betamax video cassettes, "Dynamicron L-500 Master HiFi." It supports HiFi stereo and allowed for high-quality video and audio recording. Betamax did not become as popular as VHS, and production of related products ended in 2016. It is currently difficult to obtain these new. Please only purchase if you understand that these have been stored by a non-professional. The contents have not been checked as they are unopened. 2 sets x 5 packs