"For watercolor, acrylic, and other media; Synthetic white nylon bristles; Long and short varnished birchwood handles; Crimped aluminum ferrules. Assorted Brushes, White Nylon, Set of 12 - This assortment includes nine Rounds (Sizes 1, 2, 3, 4, 5, 6, 7, 8, and 9) for filling in details and small areas, for controlled washes, and for making thin or thick lines. It also includes three Flats (Sizes 3/8", 1/2", and 3/4") for making bold strokes and filling in large spaces, and on edge for making fine lines, straight edges, and stripes." -Blick