Teq-Trode Permanent Electrodes (PRM) are the same Silica-Carbon Electrodes without the adhesive. The Permanent Electrodes are designed to use conductive gel as a separate transmission medium and need to be adhered to the skin with athletic or surgical tape.

Each PRM2-4 package contains four 2 inch (1.75 x 1.5 inches) electrodes.
Each PRM4-4 package contains four 4 inch (1.75 x 3.5 inches) electrodes.