Aspis was a thick layer of poplar wood with a layer of bronze on it, if anything it certainly is the thickest shield, scutum has one holder for your hand which would mean that it shouldn't be too heavy.
Also a Falx was able to penetrate deeply into a Scutum while against an Aspis it definately would have an harder time.
A Pilum penetrating a Aspis is just wishfull fantasy, Scutum wouldn't be able to survive the pushing in the Phalanx as well as an Aspis as well.
5 mm? Maybe that one from Deadliest Warrior or 300 but the real deal definately wasn't that thin.
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