Here’s a Karakal squash rackets rundown. This is from their 2015 – 2016 range. I have never tried Karakal squash rackets myself, but I was able to cull this info from their 2015 catalog.
First you have the “S” series of rackets, including the Karakal S Pro Elite, which some pros use; the Karakal SN-90 FF, which they claim is the world’s lightest squash racket; and the slightly heavier Karakal S-100 FF, and Karakal S-110 FF. They’re all teardrop-shaped, with a fan stringing pattern, and a small head size (455 sq. cm.). As an example, here’s the SN 90 FF, the one Karakal says is the lightest squash racket in the world:
After that you have the “X” series, which includes the Karakal X-125 FF and the Karakal X-Slam FF. These are also teardrop-shaped but have a regular stringing pattern and a medium head size (480 sq. cm.). Here’s an example, the X-125 FF:
That’s it for now, may add some more to this over time. Other rackets in their catalog include: