some average measures of usual carom cues :
collar/joint diameter is 22.0mm , and at the buttcap it's 32mm.
carom cues are mostly wrapless, and we usually cover them with a rubber or silicon wrap, removable.
ferrules are small, usually 5-8mm. rarely more than 12mm. Most are uncapped, but you can find capped. Ivory ferrules for carom don't mean "high end" , and they are verrry rarely used -at least in europe-.
shafts taper are mostly conical (or almost) , even we can now find some much more relaxed taper (see Longoni's Eiffel taper)
for straight rail/ balkline : weight 460g to 500g , length 140cm , tip diameter from 11m to 11.5mm
for 3C : weight 520g to 540g , length 142cm , tip diameter 11.5 to 12.0mm
for 5 pins : length 142cm , heavy (weight 700-750g) , but we already know that's a weird discipline
note than the "low deflection" concept is almost unknown in the carom discipline , even Predator/molinari tries to wash our brains

. no magical chalk myth too , the most used here in Europe are master and blue diamond.
many carom players, when using layered tips, tend to remove from 2 to 4 layers, & mostly do the tip install themself .