The CFY VPP Y adapter cable with 1x 6.3 mm stereo jack plug to 2x 6.3 mm mono plug is a very popular tool, for example, for transmitting a signal from a mixing console to a keyboard.
The split at both ends is about 15 cm long and the individual ends are clearly marked in red and black. Its REAN by Neutrik® connectors are hand soldered and gold plated (to prevent corrosion). The cross section of the utilized bulk cable is 2x 0,22 mm ².