Check the listing for details. Replacement Reusable Rubber Carbon Electrode Pads 4 PS (2 Red & 2 Black) 3". Condition: New. Listed at 34.99 USD. SHIPS THE SAME DAY with FAST FIRST CLASS USPS SHIPPING !!! 4 PS TOTAL - REPLACEMENT REUSABLE RUBBER CARBON ELECTRODE PADS for USE with MUSCLE STIMULATORS AND COMBINATION UNITS THAT USE standard pin tip connector (0.08 tip pin)- (2 RED & 2 BLACK ), 3" ROUND- WILL WORK ON ALL CHANNELS #1, #2, #3, #4- WASHABLE & RE-USABLE - Highly flexible with uniform conductivity over the electrode surface- Backing keeps straps clean and provides extra durability- Non-adhesive - - Conductive spray or water is highly recommended for longer reusability & better conductivity - - Slightly pliable which helps them conform to the body for maximum treatment area- Used with standard pin tip connector (0.08 tip pin)- Soft and pliable to conform to the body- Great Conductivity THIS ITEM IS FDA APPROVED