Review on Dorman 609-131 TPMS Aluminum Sealing Valve Cap - Premium Pack of 50 by Bob Walters

I have a curved bodice with a straight rib pattern, the picture shows hatching. Are they shiny and I assume they are nickel plated? The valve stems fit smoothly, but I'm wondering if I should reinstall them with a dab of anti-seize lube on the threads to prevent sticking to the valve stem. The valve stem is made of brass.