Co-Gain Mahjong

You know, I'm not even mad these don't have real names, the serial numbers are fine. So we finally found the manufacturer of these weird opticals, Co-Gain/Xuda, and even found a website and taobao storefront. So of course I had to buy all their OEM level stuff. These ones DO in fact get a name, they are Mahjong switches, just like the Dareu ones. 

Bottom Out Force: 50g

Actuation: 2.0mm

Bottom Out: 3.6mm