2 ELECTRODE DUAL SNAP LEAD WIRES- 3.5mm Plug+(12LG + 12SM)Massage Electrode Pads FOR EROSTEK ET-312 TENS This is a nice Electrode Pad/Cables Combo with 12 Large and 12 Small and durable and flexible electrodes that are excellent for applying around joints such as wrists or elbows. 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. Smaller pads included are nice for treatment/therapy for more concentrated area of current. Electrodes are Reusable They wipe clean with a damp cloth. Large Pad Measurements are: 3" (7.5 cm) by 1.77" (4.5 cm). Snap diameter connection is 3.5 mm. Small Pad Measurement are : 1.37" wide around Snap Diameter Connection is 3.5mm Each Pair of Pads are packaged in a resealable storage bag. Includes 12 LARGE Pads (6 sets), 12 SMALL PADS (6 SETS) Also Includes 2 Quantity Dual Snap Connection 3.5mm Electrode Cables Machines that have 3.5mm input jacks are compatible with the cable in this ad. Please make sure to check if your unit has 3.5mm Jack input These high-quality pads are compatible with many brand name massagers on the market with leads that connect to the 3.5mm pin snaps on the pad. Feel free to message me if you have questions on compatibility. Thank you and have a wonderful day!