The Universal 4 Pin Buckled Cable Is Made For The grove System To Connect All Of The Twigs To The Stem - Basic Shield Or To Other Twig Compatible Boards For Quick Prototyping. As A Lot Of Users Ask For Different Length Of Cables So We Made The 5Cm20Cm30Cm40Cmand 50Cm Cables For Different Applications.The 20Cm Cable Is In Default Included In The grove - Starter Bundle.