I also used these as they ended up being mislabeled and were 8mm so I a a disinfected stopper from a thread needle to it making it 6mm. The instructions say 4mm but I’ve also read 6mm can be used.
Alidya (use LBV15 to save 15%) https://aestheticmaison.com/?ref=9
As always you purchasing through my links helps to keep content coming your way. Thank you for the support.