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Lead core with steel jacket and a very thin layer of copper.
Hi Jeong, Tula information: TulAmmo converted from a bi-metal jacketed round to a zinc-coated round, which provides up to 10-15% better shooting accuracy. Zinc coating is a chemical method of surface treatment (galvanizing) which gives the bullet jacket a more uniform and consistent protective layer than that of machine-stamped bi-metal bullet jackets. You will need to contact Buds to see if these are the older or newer rounds.
Zinc-coated round
Word of important advice; be careful as I've had more ricochets with these than others
Pictures of the actual rounds are available on several websites. You can see the thin copper shining bright.