7005 is an aluminium wrought alloy[1] used in bicycle frames.
Due to its relative ease of welding, it does not require expensive heat treating.
It is, however, harder to form, making manufacture more challenging.
[2] It has an Ultimate Tensile Strength of 350 MPa, a Fatigue Strength of 150 MPa and a density of 2.78 g/cm3.
[3] It does not need to be precipitation hardened, but can be cooled in air.