Blue Velvet PME Linear switches are inspired by blue velvet cakes and feature a proprietary plastic blend from Tecsee called PME. This material is used for both the top and bottom housing and provides for a slightly deeper sound signature than other traditional plastic blends. The switches also utilize a long pole stem for a more solid bottom out sound. 

Switches are sold in packs of 10.
 
Quantity 1 = 10 switches. 
Specifications:
Lubed With Krytox 205G0
Linear
Top Housing: PME
Bottom Housing: PME
Stem: POM 
68g spring (Bottom out)
5 pin (PCB Mount)