MMK FROG switch is a Linear switch. Designed originally and manufactured by MOMOKA. The FROG switch has characteristics of smoothness, stability, confirming & thick feeling of actuation, and the muffled sound feedback. Springs in FROG 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 complete lubricate process is done with GPL-105 and GPL-205G0 Lubricates, during the manufacture of the FROG Switch. No additional greasing needed when you receive our product! The lubricate process gives the switch more smoothness and eliminates sounds made by the crosspoint contact. It also enhances the rich feedback feeling.