Slimline adapter cable from 3,5 mm (1/8") to 6,3 mm (1/4"). Like the shorter ones it is made of very flexible TPE material with a nice soft and rubbery feel. They are specially made for us. The connectors are extremely slim, what's good when you use very densely packed modules or audio interfaces. Simplicity rules: this series of cables is monochromatic black & white, as we wanted to make it look clean but organized when mixed on your system.