I have the set you are talking about. Yes it is filled with wax. Which is an odd thing to use for gluing and filling up the pieces. Personally as long as you don't use them during summer time. They are not a bad set to use. They use that set a lot in tournaments over there is Serbia and the other Yugoslavia break away countries. You will even see these used in blitz games if you watch Balkan Chess channel on YouTube.
There is a plastic Dubrovnik II set in cream & brown. They are slightly weighted but with sand. Another odd choice for weighting. These have better stability but the molding is quite poor. Also the Queen and King are too similar to most western chess players. I painted the Queen's crown grooves opposite colors to signify the Queens. This is not a bad set but it could be better.
If you order either set. I would order 2 of each. One to get extra Queens. Two to have spares or swap out the bad with good extra pieces.
With all the plastic chess pieces available, how come there's not one decent plastic Dubrovnik chess set?
There's one set out of Europe but a video on YouTube gives it mixed reviews. Says the weights are set in wax.
Another set on Etsy that is 3D printed but the pieces look rough. As in not polished like the BCE 3D sets being talked about on here.