Spring temper wire is excellent for strength, but can be difficult to use without proper tools. You will need pliers that are strong enough to handle this wire, think big!
Material is type 302 stainless steel, actual diameter of the wire to its gauge are as follows:
12G - .091"
14G - .080"
16G - .062"
18G - .048"
19G - .040"
20G - .032"
21G - .028"
22G - .025"
23G - .022"
25G - .020”