É como diz o Ralha, podes e deves, para obteres o som que pretendes. Com a combinação certa dos materiais, está claro.
Convem veres vários tipos de vassoura para saberes por onde e o que é que vais começar.
Brushes are a set of bristles connected to a handle so that the bristles make a rounded fan shape. They are often used in Jazz, Swing music, or Blues music. The bristles can be made of metal or plastic; handles are commonly made of wood or aluminum, and are often coated with rubber. Some brushes are telescoping, so that the bristles can be pulled inside a hollow handle and the fan made by the bristles can be of variable length, width and density. Retracting the bristles also protects the brush when it is not being used. The non-bristled end of the brush may end in a loop or a ball. Though most performers prefer using metallic brushes, more now use plastic brushes because of their increased durability.
Fonte:
Wikipedia
Ou seja, tens os cabelos feitos de metal ou plástico, e as pegas de madeira ou alumínio, com umas partes em borracha para terem aderência.