Don't know what the underlying material that these are made from is, but they weigh practically nothing! This made me suspicious but I need not have worried. They take solder well but if you are using using a large cross-section conductor as I was ( 3mm ) you might need to use a slightly higher temperature with your iron ( if it's adjustable ). I struggled with a 25 watt iron and made a better job with a 40W borrowed from a friend.
You will need to sleeve the pins with something because they come 'naked' as in the illustration.
The great thing about them is the fit, at least in the sockets of my Rotel amp.The best fit of any plugs so far tried. You can feel them gripping as they go in but not so tight that they are a struggle to remove.
What they 'sound' like I can't say. I installed them with some new speaker cable . The combination is spectacularly good ! Would buy again.
Toshiba TransMemory U202 64GB USB Flash Drive USB 2.0 - White - THN-U202W0640E4
25 Jun, 2020
The Best
I have tried every, reputable make of Memory Stick going and one or more of every brand has failed - except Toshiba ( and Verbatim ). If reliability matters go for Toshiba.