The black, 20' Hosa Pro MIDI to MIDI Cable is a serviceable cable with male 5-pin DIN connectors on each end. The cable features oxygen-free copper conductors and a dense spiral copper shield to block interference and hum. Musical Instrument Digital Interface (MIDI) The MIDI protocol allows communication between a computer and a digitally controlled synthesizer (keyboard, drum machine, etc.) by transmitting how the notes are to be produced. For example, commands like note on, note off, pitch shift, and tempo create much smaller files and more realistic music, relying on the synthesizer to create all audible sounds. Premium Design This cable features durable, serviceable, nickel-plated connector bodies, and the stranded copper conductors are surrounded by a dense copper shield to ensure interference-resistant data transfer. Discreet 5-Pin Connectors Each of the five pins on the connectors of these MIDI cables is wired to support all MIDI functions, including uploading and downloading data and relaying SysEx information. Multiple Lengths Hosa makes their cables in a variety of lengths to suit virtually any application.