Neef 1150 Bright Hog Bristle Brush
A bright is a flat with shorter hair & a square end. To make distinct definite marks.
Probably 90% of oil painting would be done with hoghair. This bristle leaves brush marks in the paint film where required and only the best quality Chunking bristles are selected. An extra length of hair is inserted into the ferrule formed into a mould and oven heated for a short time, giving the bristles greater spring. All of this quality control enables the interlocked bristle to retain its shape and resilience over many years.