The cue maker I spoke with regarding this matter did not specify if it was just the wooden type ferrules or all ferrules. I will be purchasing an OB-Pro shaft that is fitted with a short white plastic ferrule. I have shot with one recently and was impressed with its rigidity and snappy crisp hit. My kind of shaft for sure.
Both are good products, just a matter of personal preference. I tested a number of LD shafts and it came down to the Z2 and OB2. Not much difference. OB is made in the USA so I went with them. My cues have two different pin sizes so I have 4 OB2 shafts.