These are NuPhy Cowberry low-profile linear switches. They came in a pack of 100, but 4-6 switches had bent pins upon arrival, so I discarded them. However, there are still plenty left. Compatible keyboards include: Air60 V1 / Air60 V2 Air75 V1 / Air75 V2 Air96 V1 / Air96 V2 I used them once but they didn't suit me, so I replaced them immediately. Including shipping, they cost around $40 (5900 yen) on the official website, so this is about half price. It's recommended for those who want to try these switches. I'm decluttering, and since they're not worth a high price, I'll discard them if they don't sell in about two weeks.