Description below of O'Min 19" carbon-fiber tube inside 29" maple wood shaft. Seyberts and Ozone Billiards sell O'Min cues with CF/Maple combination shafts but don't describe them. This figure is from a German website and is of O'Min model F2. Note part of shaft is a vacuum and no mention of anything inside that --- part of the shaft is hollow and airless.
View attachment 876212
why would it be vacuum? they probably just don't know the difference between air and vacuum in translation