They are perfectly symmetrical. You brew in the center of two layers, much different from the standard 3 layers on one side and 1 layer on the other side. St. Anthony Brand Filters filter are thinner and have a different structure allowing faster flow.
-Save time, no need to pre-rinse
-Uniform, dual wall filtration
-Unmatched cup clarity
-Sized for Phoenix 70, Phoenix 70 v2, and C70.