These switches are part of a recent group buy.
These are Cherry MX Blacks with a double-shot stem which dampens the sound made.
These are PCB Mount.
Please be warned that these (and any other PCB mount silent black switches) do not seem to be correctly weighted and are closer in feeling to Cherry MX Reds than Blacks. This is an ongoing issue with Cherry. updates can be found here: https://geekhack.org/index.php?topic=90801.400
Please order at least 10 of each switch type you intend to order. Smaller orders take up more time to package as well as increasing average payment processing fees.