These concentric needle electrodes have a machine sharpened tip and matching material properties of canula and core for optimal EMG signal quality and excellent noise reduction. They have a recording area indicator mark. The needle electrodes are pre-sterilized by ETO gas, are lead-free and latex-free, and RoHS compliant. They connect easily to a flexible, reusable 4 ft/1.25 m cable with a 5-pole DIN connector. 25 needles per box, and the cable is sold separately.