SQUARE SHAPED ELECTRODES MASSAGE PADS (4) + 3.5mm Plug CONNECTOR WIRE CABLE LINE 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. + Dual Snap Type Electrode Wire Cable Line Lead 3.5mm Plug ===>(We ask please be sure you confirm and check that this is the size you need before ordering, thank you) These electrode 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!