I have just looked - They have made a mess of listing though.
National Deep Brood is Langstroth
National Brood is OK
No Super foundation for Nationals
Deep Brood isn't deep but 14 x 12.
The national frames are shown with the side-bars upside down - so not quite so 'easy to assemble' if a novice user follows the photo.
The Easibee website is also wrong in places.
5/10. See Teacher after class.
If this has been listed on websites for a while, it shown very poor attention to detail.
There is often confusion between 14 x 12 and National brood frames and I am sure that there will be a lot of returns as so many people don't read the description properly.
SN frames are for supers
DN frames are 'Deep' brood frames
14 x 12 frames are therefore not deeps. A 14 x 12 frame is actually a xN5, the manufacturers could come up with a letter for x - say J for Jumbo or whatever.
May your bees read the same books as you do.