These are Z button switches of the same form factor as original Z button switches found in Nintendo Gamecube controllers. While the switches found in Gamecube controllers are most of the time made by Hosiden, these are made by Mitsumi, who is also a manufacturer for original Gamecube controller parts.
Whereas the Hosiden Z switches (when new) tend to have 50-58 gf of resistance, these Mitsumi switches have slightly more, with usually 63-75 gf. This makes them just a bit more well-suited to be combined with Z buttons where the metal spring is either removed or bent in to have less resistance. (With Hosiden Z switches, particularly worn ones that only have around 35-40 gf resistance remaining, springless Z configuration can often have them so soft that accidental presses are likely.)
All of these switches are brand new and were never used in a controller before.
