These brushes are made of soft and resilient goats' hair, coloured to look like a pony-hair brush. They are for applying powder and blusher in cosmetics and there are various sizes.
The smaller sizes (P4, P6 and P8) are particularly good for highlighting and shadowing with eyeshadow/rouge and the larger sizes (P10 and P20) are recommended for larger areas using pressed and loose powders.
To apply the powder take it up with the brush and knock off any excess powder on to your hand before applying the powder to the face.
Powder Rouge Brushes can be cleaned with shampoo or soap and water. Shake the water off and lay horizontally on a tea-towel to dry. Do not leave the brush upright during drying because the water will then be absorbed into the shaft.