Product description Reuse Each Pad Up to 25 times Per Pad 3 in." (7.5 cm) by 1.77 in" (4.5 cm) 3.5 mm diameter pin - Perfect Professional Replacement TENS Electrode Pads Feature PREGELLED with Premium Quality Gel for immediate use. No Extra Gel Needed We offer these Premium electrodes for tens unit and EMS machines. Can be used Multiple times per electrode pad / tens pad. Works on all tens , ems, pulse massagers with 3.5 mm pin. Double Sealed for Freshness Reusable Multi-stick Gel for reliability and durability. Made with high quality premium gel so the pads stay on. Compatible with : EliKing, , HealthateForever HiDow IQ Massager Irest iSmart Magic Massage Magic Masseuse Massage Pod Palm Massager Pinook Smart Relief tec bean units Nursal And all others that utilize the standard 3.5mm snap connector.