What is so unique about the X switch is its choice of materials. I believe none of you have tried a switch that uses POK as housing materials. The POK material is more uncommon as it just has been introduced to the market by BSUN and JWK. The POK material's full name is polyketone. Its coefficient of friction is 0.04 which is only higher than LY (0.03) making it the top 2 smoothest material used to make switches. It is also super durable as its wear resistance is 14 times stronger than POM. Its shock resistance is 2.3 times better than Nylon and 1.4 times better than POM

(Sold in Packs of 10, 1=10 Switches)

Details
Type: Linear 
Stem: modified-LY
Top housing: UPE mixed POM
Bottom housing: POK
Spring Weight: 52g bottom-out long spring (45g operating force)
Factory Lube: DuPont 205 and 105 mixture on the slider. Dry film lubricant on the sliders of the stem and on the springs.
Pins: 5