There are many types of metal keychains, common ones include:
Alloy keychain: Made of alloy material, it usually has high durability and texture.
Stainless steel keychain: Made of stainless steel, it is rust-proof and corrosion-resistant.
Copper keychain: Made of copper material, it usually has better texture and weight.
Aluminium alloy keychain: Made of lightweight aluminum alloy material, suitable for occasions that need to be carried lightly.
Titanium alloy keychain: Made of titanium alloy material, it has high strength and corrosion resistance.
Black oxidized keychain: The specially treated metal keychain has a black oxide layer on the surface, giving it a unique appearance.
The above are some common types of metal keychains. Different materials and processes will give keychains different characteristics and uses