These are “coasters” designed to as stands for smartphones. They are sold to businesses such as hotel chains. They have logos engraved as shown above.
These are constructed out of stainless steel, and hold all popular smartphone models. The main benefit is that it’s easy to quickly see your iPhone screen, and it may lead to fewer misplaced phones as people have a place to set it.
They are about six bucks each, and companies have to order at least 100 of them, so it’s not something for a single customer. IT’s the kind of thing you get if you want to promote your company name.