Electrode 4 Snap Cable + 4 pc Square Digital Massager Replacement Electrode Pads 5x5cm or 2"x2" Electrodes are Reusable They wipe clean with a damp cloth. Measurements are: 5 cm by 5 cm or about 2" by 2".Snap Connect diameter is 3.5mm Includes 4 Pads (2 sets). Each set (2 pads) is packaged in a resealable storage bag. Includes Electrode Lead Cable 3.5mm that will work with these pads in this ad. Note:Please be sure your model has 3.5mm jack, works with models with 3.5mm jack-will not work with PM3031 ModelHERE IS A FULL LIST OF MODELS THAT THIS CABLE IS COMPATIBLE WITH(NOTE-CABLE IS COMPATIBLE W/ SUPPLIED PADS IN THIS AD )PM3030,HV-F127,HV-F128HV-F124,HV-F124PHV-125,HV-126,HV-F002AHV-F115HV-F122 These pads can be used for areas of the body that are flat, like back or thighs. They are great quality and come with a thick layer of non-irritating conductive gel that adheres well to your skin, but leaves no sticky residue when the electrodes are removed Thank you and have a wonderful day!