50 count Factory Box - New Old Stock K40Y-9 Russian Military Surplus Paper in Oil (PIO) capacitor - .033uF 200V . 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 .033uf a good value for P90's and bridge humbuckers a little less treble when tone and volume is rolled off than a .022uf. Super nice caps for the money that are getting harder to find.