... conductivity CE,FDA listed massage electrode,tens electrodes,ems electrode,self-adhesive electrode,tens pads,ems pads,electroherapy electrode,physiotherapy electrode ... & Reinforcing Fiber. (Wire can be substituted by snap.)5. Hydro-gel ;Bio-Compatible, High Adhesion6. Liner :PETSoft cloth and foam backing ... 1.95 to 2.1mmsnap size:3.6/3.9hydro-gel is skin friendly and allergy freeBoth sides of smooth ...