... conductivity CE,FDA listed massage electrode,tens electrodes,ems electrode,self-adhesive electrode,tens pads,ems pads,electroherapy electrode,physiotherapy electrode ... the color customers wantPigtail and snap connection optionalElastic socket fit pin sizes of 1.95 to 2.1mmsnap size:3.6 ... 11mm because the tube it can change size with the pin diameter and then will recover its original shape after cables ...