These products are extensively used for the audio-visual equipment, power supply equipment, welding machines, post telecommunication equipment and data handles electrical appliances equipment and are particularly applied to acoustic products. Features: 1) Uses CP stalk direction derivation 2) Circular or flat form 3) No response type construction 4) Sealed by wreath oxygen resin 5) High frequency 6) Low exhaustion 7) Stable capacity 8) Insulation 9) High electric resistance 10) Good self-healing 11) Applied to the direct current, pulsation, can be used in high frequency strong electric current