Question for Illustration about Peloponnesian War

[hoplite14gr]

They might have taken the basic desighn and used various other materials.
some good some inferior.
If the construction was like the eoman shiled found at Fayum Egypt then it might have its problems.
No Greek thyreos is known to have survived so far so speculation is rife..
Considering the dificulties that that Roman troops had when facing the front of the phalanx then we may asume that shield resistamce had something to do with it.
KInd regards