The Mason Pearson Hairbrush is not mass produced. Most of the work is carried out by hand, using techniques pioneered and patented by founder Mason Pearson over 100 years ago and improved over succeeding generations.
In general, the longer the hair the bigger the brush required. However, if a person is more comfortable with a smaller brush, it may be necessary to use a smaller mixture model instead of a larger pure bristle one. The Sensitive models are for very fine or thinning hair. The Child’s model is for children 3-6 years old.