b-r-s Blue Cross GEL-bb Flat #4 Flat #4 Total Length: Approximately 153mm, Bristle Length: Approximately 7.5mm, Bristle Width: Approximately 4.5mm, Thickness: Approximately 1.5mm For applying base and top coats. With its supple firmness and good cohesion, you can apply evenly without streaks. I have used it several times, but I think the condition is clean. Thank you for your understanding that it is used. The brush has been wiped clean.