A mystery manufacturer is one thing, we can likely figure that out from mold markings and known features in a product line. That really doesn't matter much if the product is good. My big concern is this unknown material. Can we get some sort of spec on Y1 so we know what we're buying? It doesn't have to be exact.
Is Y1 harder or softer than POM? Or similar to a different material? LY, P3, Nylon, PC, etc
Does Y1 have a coefficient of friction greater or less than POM? Or is it similar to another material?
I ask because I want to know how smooth this switch will be and what sort of sound it will have.