ALL jewelry clasps with any type of spring mechanism do in fact use STEEL springs.
It is the only material that is strong enough and can retain its memory.
Therefore they will be slightly magnetic.
Stamped 585 for 58.5% gold
Outside Diameter: 6.0mm
+Jump Ring & Trigger
Inside diameter: 3.55mm
Ring gauge: 18gauge
Jump Ring OD: 2.40mm
Jump Ring ID: 1.35mm
Jump Ring ga: 22gauge
Weight: 0.068 DWT or
0.105 grams