Mainly imported from Japan SUS301 or SUS304 and phosphor bronze for raw materials, SGS test (see SGS report) that all materials comply with EU environmental protection (ROHS) requirements, in order to reduce the contact resistance, the customer can custom gold, silver, nickel, etc. 
 Our company has a higher metal shrapnel life (for example: cross, circle some shrapnel up to 100 million or more); controllable diameters 3mm ~ 20mm, dimensional tolerance ± 0.03mm, adjustable pressure range up to 60g ~ 4kg, stress tolerance can be controlled within the ± 30g (quality testing by ± 10g), in order to meet customer's specialized needs.