I used to use the Kontrol Freek Snipr 13.6mm convex thumbsticks. Eventually after several years and many thousands of hours of use they wore out and needed replacing. I have replaced them with these Kontrol Freek Cold War extensions as they are the only 13.6mm convex extension Kontrol Freek currently sell.
They have a few improvements compared to the old Snipr model.
- Tighter fit on the original thumbstick.
- Better thumb pad grip.
- It looks like the new thumb pad design will last longer before it wears out.
The price you pay is expensive but I think probably worth the extra for the quality and years of use you will get out of one set.
I am very happy with the and highly recommend them.