100% Kolinsky size #10 perfect for a beginner or even advance nail tech this size is the starter and go to for many nail techs leaving room for upgrades in the future without becoming obsolete.  Many nail techs that have upgraded to a larger size find coming back to a size #10 for situational needs like refills and shorter nails.  This brush is 100% high grade aluminum powder coated with a beautiful Smoked black finish.  Fully engraved and acetone and monomer resistant.  Allows easy cleaning without worrying about damaging your brush, with a tightly sealed funnel to the hand piece you will never have to worry about this brush coming apart.