New Old Stock K40Y-9 Russian Military Surplus Paper in Oil (PIO) capacitor - .022uF 400V . The K40Y-9 are high quality PIO capacitors made for Russian military. The conductor is made of aluminum foil and the dielectric is oil saturated paper, glass sealed in a metal body. These capacitors provide excellent sonic characteristics, and a high tolerance within a wide temperature range .022 is common value in Les Pauls, SG's ES Series, Epiphones, any guitar using Humbucker Pickups, and some newer Fenders. Super nice caps for the money that are getting harder to find.