Mobile Fidelity Sound Lab (MFSL or MoFi) is a company that produces reissues of classic albums. All releases are made from the first generation master tape and mastered at half-speed, allowing for the finest sound quality possible. In the past, MFSL has produced cassette tapes, LPs, CDs, and even VHS releases of a few titles. In addition, each title is licensed to be mastered, manufactured, and sold within a specific time frame, and because of the limited quantities produced, the releases are highly sought after by collectors.