The bristle width on these synthetic hair brushes is about 5.5-6.5 mm. It's just a tad smaller than the Original Unicorn Horn brushes and has 1/3 less bristles.
For scale we have the new brush next to the original brush next to a 14mm cabochon (like on the bottle tops of Baroness X polish). The new brush (this listing) has the pink to white bristles and a matte gold ferrule.
Tap here to go to the Original Unicorn Horn brush listing.
Individual brushes may vary ever so slightly as these are a hand made product. This brush has been in testing for 3 months with minimal wear and no melting from acetone.