The Winsor & Newton Winton Round size 1 brush is made from good quality Chinese hog bristles & are h&-set into seamless corrosion-resistant ferrules. The natural curve of the hog bristle produces a resilient brush which retains its `turned in` shape even after heavy use, allowing the artist more control & accuracy, whether painting with oils, alkyds or acrylics. The Winsor & Newton Winton Round size 1 brush is the oldest brush shape, in smaller sizes they are indispensable for detail lines & highlights.