Pretty sure you want stainless steel for brakes, the PA are zinc or cadmium plated steel.
Curious.. are the ones at hobby shops the same hardness? feels like the ones at hardware stores sometimes are harder..Hobby shops $12 for 6 packs. Amazon.ca $14 for 100 depending on size most hobby shops mostly smaller.
- RC Clips Rod diameter:Approx 0.047 inch /1.2 mm