Sandvik Precision Fine Tetrode Wire 50 Feet.
Alloy in 55/56 AWG size (0.0005") in 1/4 hard state with polyimide coating. Well suited to electrical stimulation measurements at nerve endings. NiCr alloy. Polyimide coating chosen to minimize biological impacts. Can be multifilared for multipoint measurements for multivariate analysis. Proven product in use globally by numerous research facilities. 50 foot length of wire. (Note: attached photo is bulk spool. Your spool will have 50 feet.)