LARGE REPLACEMENT MASSAGE PADS (16) ELECTRODES(RECTANGULAR) FOAM FOR TENS DIGITAL MASSAGERWhat is the advantage of foam backed electrodes? Many clinical therapists recommend foam backed electrodes when the treatment is combining hot and cold therapies with electrode stimulation. The foam backing repels moisture created by the treatment and adds insulation between the external therapy and the electrode pad. Many of our customers prefer the foam backed electrodes for their smooth touch and flexibility, though they are somewhat more high profile than the mesh backing. Mesh or cloth backing is generally slightly more flexible than their foam backed counterparts. Large Size Rectangular FOAM Pads that 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. Electrodes are Reusable High-quality pads are compatible many units and Digital Massagers that connect to 2 mm pin leads They wipe clean with a damp cloth. The Measurements are: 3.14" long by 2" wide Includes 16 Pads (8 sets). Each set (2 pads) are packaged in a resealable storage bag. Thank you and have a wonderful day!