In a direct comparison with other offers, where you just get a colorful ribbon cable with crimped sockets (with which one the "plug-variant" must then tinker with the supplied pins, I find these jumpers very good. The pins of the thickness ago about 0,6mm (estimated) and lyres for this reason not from the contacts of the breadboards in the long run.
To smell, I can say the following: It smells to me like any other cable also, which I have been off the roll, or taken out of the packaging. From "Chemical alarm" I would not talk so. But eventually my nose is as easy to insensitive. Each NYM cable smells as much chemical for me.
