Wooden scrubbing brush is made of plain beechwood and stiff sisal and piassava fibre bristles.Sisal fibre - a very robust fibre from a cactus species grown in Africa. The fibres are strong and durable, and do not absorb water easily. Unbleached sisal is a golden creamy colour.Piassava fibre - a coarse, elastic palm fibre originating from West Africa and South America.