what are the film capacitors?

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"film capacitor" is used in the leach amp. to which film capacitors does this refer?

C2, C3, C15, C16, C23, C24, C25 - 0.1 uF, 100 V film (DigiKey P4725-ND, 0.4 inch or 0.2 inch hole spacing)
C7, C12, C17, C18 - 0.1 uF, 50 V film (DigiKey P4525-ND, 0.2 inch hole spacing)
C19, C20 - 0.01 uF, 50 V film (DigiKey P4513-ND, 0.2 inch hole spacing)

I can't seem to figure out exactly what film caps he's talking about

Also, What is NPO caps?

Thanks
 
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