Escoda Signature Collection Alvaro Castagnet Set 1 Contains - Prado Round - 8, 10 & 12. Tame Synthetic Sable Hair; The spring, snap & absorption of liquids is at par with Sable Hair. Ideal for Watercolours and suitable for Gouache, Acrylics, Mixed Media & Oil, Stiffness: 3 on 6. Triple Crimped Ferrule, ensuring that it will remain in place for a lifetime of use; Substantial belly, precise point and amazing spring / snap. The perfect combination of 3 different diameters and 3 lengths in the fibres results in brushstroke's like the ones made of natural hair.