These are Tecsee's new Sapphire switches, featuring a PC mix shell, a tactile POM stem, and a 63.5g gold-plated progressive spring. They come very lightly lubricated from the factory, and Tecsee has confirmed that they can be safely lubricated without the need to clean them.

• This model is compatible with the keyboards: QwertyKey61, RK61, RK837, GamaKay K87, GamaKay K66, Keychron K2, K4, C1 and all 5-pin hotswap keyboards.
• Brand: TECSEE
• Style: Touch
• They come pre-lubricated from the factory.
• Operation: 2 mm
• Full travel: 3 mm
• Pressing force: 52g
• 63.5g bottom out
• STEM Material: POM.
• Housing material: PME
• Double gold bow 63.5g
• Plate mount (5 pins).
• Compatibility with LEDs on the switch: SMD and LED hole.