The patch-panel editions of the Tom Oberheim SEM use 3.5mm (1/8") jacks for the user patch points. Since these are a little hard to come by, we had Mogami make us six-foot mini cables for the front panel. These are six-feet long and intended for connection to other synths in your setup- fully compatible with Eurorack modular gear such as Doepfer, Cwejman, Analog Systems, etc. They're guaranteed for life and easy on the wallet too. Cables come in packages of four.