The HMX Silent Sakura switch is the first silent HMX linear switch that I know of. According to Mage Studio, these switches come with a great balance between being quiet and having a great typing feel; They don't feel as mushy as most silent switches there are, and the bottom-out is very comfy. They might not be the quietest silent switch, but they are one of the best silent switches to type on.

1 quantity = 10 switches 

Switch Type: Silent Linear

Designer: Mage Studio

Manufacturer: HMX

Stem material: POM

Top Housing: PA12

Bottom Housing: Modified PC

Operating Force: 45±2g

Bottom-out Force: 53±2g

Pre-travel: 2.0mm

Total Travel: 4±0.3mm

Spring: 22mm KOS single-stage extended

Factory Lubed: Yes! mixed GPL105&GPL205 on leaf spring, stem feet, and bottom housing rails.