MMK special edition Christmas Bell switch is a Linear switch. Designed originally and manufactured by MOMOKA. The MMK Christmas switch has characteristics of smoothness, stability, confirming & thick feeling of actuation, and the muffled sound feedback. Dual-stage springs in MMK Christmas Bell switches are made of Japan exported SUS304 Steel, manufactured into springs with the best machinery. This gives us springs with unity diameters and durabilities, which enhances the resilience of them. A lubricate process is done with GPL-105 Lubricates, during the manufacture of the MMK Christmas Switch. No additional greasing needed when you receive our product! MOMOKA improve the lubing process to achieve more consistent and human-like results, gives the switch more smoothness and eliminates sounds made by the crosspoint contact. It also enhances the rich feedback feeling.