Probably the most popular sized brush used by Nail Technicians.
The size of the brush is usually determined by the size of the ferrule
opening, so a larger numbered brush will result in more hairs and
thickness.
Kolinsky Sable and Sable brushes are produced from
different animal hair and it is believed that most Nail Technicians
prefer Kolinskly sable as it is has superior strength and resiliency.