-Direct replacements for the Xbox One controller. They are shaped like a Playstation 3 thumbstick with a domed top, but different dimensions that make them unique from the Xbox One and the Playstation.
-They are about 1mm thinner in the mid section giving 14% greater range of motion and allowing the PODs to sent out a higher value.
-Cheap knock offs and stock PS3 sticks will limit your range of motion by 12% (26% difference) and will result in Slow Turn because the PODs cannot transmit the proper values. 

2x - Custom Convex Thumbsticks 

To install these yourself, make sure to purchase the Xbox One Tool Kit.
You can find it here:
XBOX ONE TOOL KIT