The bristles of these washing brushes are made from a mixture of bassine and white fibre. Both traditional, natural fibres.

Bassine (Borassus Flabellimormis) or the sago palm grows in the East Indies as well as in Sri Lanka. The process of threshing the dried palm leaves releases the leaf fibres. These are a brownish colour and typically softer and more fragile than other piassavas. The Colombo bassine from Sri Lanka is a more rigid type of bassine.

White fibre or Tampico is extracted from the leaves of certain species of Agave (Agaves Sisalana, Agave Foreyodes) which grow mainly in Mexico. The fleshy leaf of the Agave plant is cut off and threshed, after which it is beaten with thick sticks so that the fibres are released. On large plantations, threshing machines are used. The fibres are then dried in the sun and sorted according to size, length and colour. The natural colour varies from green to yellowish white although the fibre can also be black or brown as well as grey. The material is used extensively for making yard brooms, panel brushes, deck brushes, nail brushes and bath brushes.