Nichicon capacitors are some of the finest electrolytic capacitors in the world.  Built of excellent quality and made to last, they have very high Ripple ratings and very low ESR, very important ratings for high quality audio power supplies.  Please check this particular capacitor on the datasheet included in the photos.  These are very high quality capacitors, especially for 400V, as can be seen in the ratings:

These are impressive numbers for most power caps at this voltage rating.

Beezar Audio used these in the B+ tube plate voltage supply in the Torpedo III headphone amplifier.

These were purchased directly from Mouser.  Identical ones are no longer available at Mouser, but a different version at the same size and rating now sells for $1.52 each ($6.08 for qty 4), but with $7.99 minimum shipping.

I'm a USA Seller and recently retired from Beezar Audio.  Note that the shipping is calculated for single sales.  I will refund any overage in shipping for volume purchases.