JST German Colour-Coded Insulated Bootlace Ferrule Crimp Terminals A range of industrial standard German colour coded insulated bootlace ferrule crimp terminals. These insulated bootlace ferrule crimp terminals are made from oxygen free copper which is both robust and highly conductive with excellent mechanical and electrical characteristics. The terminals are then electroplated with tin and treated by a special process developed by JST. This method ensures that there is maximum adhesion of the electroplating, reduces electrical resistance and increases resistance to corrosion. The insulation of these bootlace crimp ferrules is made from polypropylene which has excellent flame resistance and insulation properties. These insulated bootlace crimp ferrules are available in various wire sizes.