Gesso String Bound Brushes are available in short length in sizes 2,4,6,8,10,12,14 and 16 and also a slighty longer length in sizes 10 and 12. The hair is of a traditional domed firm hog hair and this is string bound onto a wooden handle to avoid scratching delicate objects or furniture. The Gesso brushes are used for applying the gesso's, boles and clays.