This is a Brand New Lot of 10 Carli 0.47uf Metallized X2 Poly Film Safety Capacitor MPX40/100/21.  
     This superb capacitor was designed to remove every trace of modulation hum and AC interference from your video and audio circuitry. Hermetically sealed with UL 94V-0 epoxy. Self-healing. Cross-line suppression. Insulation resistance of 15 giga-Ohms.
Brief technical specifications on this audiophile-grade interference attenuator:

1. Rated voltage: 250VAC/275VAC/310VAC
   
2. Insulation resistance: > 15000 Megohms for C =0.33µF. 5000 Megohms for C>0.33uF ( Measured at 100 ±10VDC/60s).
3. Terminal voltage: 1183VDC / 1min
4. Voltage rise time of 5~10s,
5. leakage current 10mA, ARC close

For $1.00/capacitor, this offer represents an outstanding value!