Description Andrew Mack’s Gilder’s Sizing Brush (RP-5) was designed for water gilding glass with loose leaf in reverse for Signage, Art, Decoration and much more. The brush hairs are 100% pure ox hair and wrapped with a chrome plated brass ferrule attached to the handle with brass nails. The handle is a plain wood handle. The overall length is 7″. The width of the brush is 1 1/2″ and the hair length out is 1 1/4″. The Gilder’s Sizing Brush uses ox hair for it’s thin and soft texture, giving its user consistently smooth brush strokes and larger hair surface area to hold more adhesive.