The Easy@Home Reusable TENS and EMS Electrode Pads are professionally made with high quality and non-simulation to skin hydrogel and carbon film with a soft white cloth backing. The size and hand shape is ideal for application and the 3.5mm diameter can fit to most TENS massagers with snap on wire such as Easy@Home EHE029G. Note, this is NOT compatible with Easy@Home EHE009 and EHE010 TENS Unit. The hydrogel is reusable for many times to provide convenience to users while also helping them save money.