Breadboard Jumper Leads

Hi All,

Just a note of caution!
I have only just started using the Arduino and found that I was getting a lot of failures when using the breadboard and jumper leads..
On investigation I found that the problem was the jumper leads in that some appeared to have an insulative coating on the pins, this made the connection to the breadboard unreliable.
My solution was to clean the pins with a very fine abrasive and then test before using, it seemed too much bother to return them.
I obtained my leads through Amazon from a supplier in China.