Six-packs of 3" squares, 3" tall. Made in the U.S. entirely from cow manure. Roots can grow right through the walls of the pot, and additional plant food becomes available to the root zone as the pots readily decompose.
Slightly bigger than the plastic Six-packs, so you can’t fit six in a standard 1020 Tray. Three fit easily, you might be able squeeze in four if they were wet.
Sadly, complaints about above-ground durability led the manufacturer to alter their process in such a way that these pots are Not Allowed for certified organic production.