We can use any metal that is thin and plastic, but the materials that we generally use are as follows.

Material kinds	Material names
Phosphor bronze	C5191/C5210/C5212 and others
Beryllium copper	C1720 and others
Inconel	Inconel625/Inconel718/NCF series and others
Precipitation hardening stainless steel	ASL350(AM350)
High corrosion-proof metal	Eljiroy
Hastelloy	C276/C22 and others
Nickel	NW2200 series
Various kinds of titanium	ST40~80 and others
Stainless steel	Various kinds of austenitic,martensite,ferrite stainless steel and others
Monel	NW4400 series
Constant elastic alloy	17-7PH/Elingbar/span C
Tantalum	Tantalum
Various kinds of aluminum	A1000-A6000 series

We may ask you to supply the above materials, depending on the thickness and size required. The surface of material can be plated or given the EP treatment.