Ancient Metal Valheim 1.0.20
Ancient Metal is a crafting material that stacks to 30 in Valheim.
“A withered metal from ancient times. No one knows what it was once used for.”
Ancient Metal is a material described in the game as "a withered metal from ancient times. No one knows what it was once used for."
Each piece weighs 12, and you can carry up to 30 in a single stack. It cannot be teleported, so you have to carry it yourself rather than send it through a portal.
Other material items
Acorns, 
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis, 
Asksvin Ribcage.