Resistick IIâ„¢ coated blade, ball and needle electrodes are expertly coated with PTFE(polytetrafluoroethylene). They move more effectively through tissue becausethey resist eschar build-up making them much more efficient during surgical procedures. Unlike the common stainless steel electrodes with a propensity to accumulate the discarded blood and tissue, Resistick IIâ„¢ coated electrodes simply wipe clean."- Blade Electrode, 4", 12/bx 14-21 Days