cyclotr0n........this is purely deductive logic but it really does make perfect sense.
It's not that I have heard of any problems whatsoever using Juma as a ferrule material on a cue shaft.
It's the opposite of that that carries the most significance for me......and I've been playing pool for 54 yrs.
In the 5+ decades I've been playing pool and acquiring & selling pool cues, I have "never" heard of any complaints, criticisms, or actual examples
where Juma was in question for pool cue material......inlays, rings, cue butts, inlays, joints and ferrules. In recognition of the ivory ban, Juma would
otherwise seem to have lots of natural appeal for cue buyers, especially if they travel with their cue(s) internationally. From afar, Juma does resemble
ivory and some people even consider it a suitable substitute for the real deal, however, if durability is your concern, don't be......history confirms this so.
Matt B.