Purchased last year at a medical supply shop. It's recommended to stock up on sponges as they are consumables! Product Code: M・EDK0428(362-8021) Manufacturer: Minato Medical Science Product: Suction Electrode Slim Fit Sponge M Size Interference wave, low frequency sponge, round, 8 pieces Condition: New, unused Stored at home, but it's a new, unused item. Feel free to ask any questions. ^_^