It's a custom design to fit the Taom V10 cue chalk. Most likely it works with the rest of round Taom chalks. Probably even the Predator Pyro (untested).
It has a magnetic holder (a disc magnet was buried inside during the printing process). The chalk is press-fitted to the holder.
There is also a magnetic closing dual carrying case.
The disc magnet it's 20mm in diameter and it's maximum 4mm thick. During printing, the printer can be paused on layer 18 to introduce the disc magnet (in my case a bit press fitted) then the print can continue.
The 2 cylindrical magnets used for the case are 3mm in length and 3mm in diameter.
The chalk is press fitted in the holder.
Printed on Bambu Lab P1S with 1.75mm filament, 0.4mm nozzle, 220 degC extruder temp and 55 degC bed temp.
The author marked this model as their own original creation.