NetDot Gen10 Micro USB Nylon Braided Magnetic Fast Charging Cable with Side LED Compatible with Android Device(3.3ft/3 Pack Black)

Q: What material covers the cables?

Not sure, it’s not cheap it’s woven

Q: What does the adapter weight?

If by adapter you mean the tiny connector that plugs into your phone or tablet, then the answer is less than an ounce. It's tiny. If you have a case on your phone, then the adapter will tuck nicely inside your case and you will not even notice it. If you don't have a case (which you really should), then it will stick out from the bottom of your phone and be noticeable.