If you are buying CDE Dipped Mica Capacitors then you may be paying too much!

It is well known that natural mica is extremely stable against heat. SE Capacitors are manufactured from selected Indian ruby muscovite mica having optimum electrical characteristics. Silvered mica is made by printing electrodes on mica film with special silver paste. The silvered films are stacked to the desired value interleaved with metal foils for contact. Then the terminals are clamped on to the element. (The terminals are copper clad steel wires finished with a solider coating for good solderability).