I was hoping for more but these leads are reminiscent of those sold by bargain electronics houses in the 60s and 70s.  The wire is of a very light gauge which has more meaning than just current carrying capacity.  They do not stand up to flexing and will break after a short period of use.  I became curious about how the lead wires were bonded to the clips.  I pulled off a few covers and couldn't see how this was done.  finally I saw the end of a copper wire sticking out of the crimp next to where the insulation went in.  I subjected one to destructive analysis and found that after the end of the wire had been stripped the copper wire had been bent back along the insulation and the clip was crimped on it.  Without being soldered the electrical connection won't be good for long.  Wear from bending will gradually soften the insulation and the force that holds the wire and clip in contact will weaken resulting in an a high resistance connection.  Also the crimping was not uniform from one clip to another, some of them being just barely holding.  This indicates a primitive manufacturing jig or maybe they were crimped by hand using pliers.