Becue offers a full carbon fiber cue. And there are numerous colors and designs.
My Becue plays damn good, but I'm using it with the Becue butt.
To me, it hits more like a wood cue than any of the REVO shafts that I've tried on the various wood butts that they have been coupled with.
FWIW, I've tried my friend's Becue Prime M 12.5mm on his custom wood butt (don't remember the maker at the moment) and it doesn't feel as "good" as my Becue does. Maybe that is because I've got used to mine, or maybe it has to do with carbon being attached to a wooden butt vs a carbon butt.
Someone mentioned in this thread (and other people in numerous threads on this site) that they didn't think the butt really make a difference. I totally disagree with that.
I have a custom wood shaft that I had made by Schmelke. It is 29", 13.25mm, 15" Pro taper, and has a 1/2" XTC ferrule and a black phenolic collar. It has an Ultra-skin soft tip on it. The joint is 3/8-10 flat faced, wood to wood. I had it made to fit two cues. Both cues are almost the same weight with the shaft and they are very close in diameters for the length of the butt.
On one cue (full spliced ebony nose with purple heart back end) with a G-10 pin, phenolic joint, and a black leather wrap, the shaft hits "stiff" and makes a "ping" when you shoot with it. It feels really "hard hitting".
The other cue is a RS-11 McDermott that isn't full-spliced and it has a linen wrap and an implex joint. On this butt, the cue plays way "softer" and feels nowhere near as "stiff". Also, the sound is muted and there is no "ping". To me, the shaft is much more "user-friendly", on this butt, when it comes to controlling the cue ball.
There is a noticeable difference between the way the shaft plays, sounds, and feels when you switch it between the two different butts.
If any pool scientist wants to believe otherwise, they are free to come over and try the cues out.