||I purchased in June of 2021. Synthetic leather with novasuede inserts. Black is just a bit darker than the stock charcoal, but that was being compared toy very dry 30 year old seats.
I did the install myself and it was quite easy for a first timer, I attribute that to the quality of the design. A+
As for materials, I've only had them for two years and I'm gentle with them, but they still look like they were just installed. I couldn't be happier, they've made an incredible improvement in cosmetics and comfort.