ERG-Jet disposable contact lens electrodes for electroretinography, by Swiss manufacturer Fabrinal. 12 mm (0.5") diameter, 7.9mm radius of curvature, neutral optical quality. Pre-sterilized; single patient use only. 1 meter lead-wire with standard 1.5mm touch-proof safety socket. 5 year shelf life. Box of 6 pairs (12) of contact lens electrodes.