Plastic hairbrush with easy grip handle on the upper side. The brush is very light and it is easy to insert a thumb into the handle.
This hairbrush has broken in every way but the user still thinks it is very good. He has not found a new one to buy. It is very light, weighs next to nothing.
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Denman has a similar hairbrush, denmanbrushus.com (last checked May 2020).