Chitin Valheim 1.0.20
Chitin is a crafting material that stacks to 50 in Valheim. It is used to craft Abyssal Razor and Abyssal Harpoon.
“A shard of crustacean shell.”
Chitin is a material described in the game as "A shard of crustacean shell." Each piece weighs 2, and you can carry up to 50 in a single stack. It can be teleported, so you can take it through a portal with you.
Chitin has no effects of its own. Its use is in crafting: it goes into the Abyssal Razor, the Abyssal Harpoon and the Fins of Destiny.
Used to craft
Abyssal Harpoon, 
Abyssal Razor, 
Fins of Destiny.
Other material items
Acorns, 
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ancient Metal, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis.