WINSOR & NEWTON SERIES #7 Series 7 is the world's finest water colour brush. It is manufactured from only the finest pure Kolinsky Sable hair, in rust proof, seamless nickel plated ferrules with black polished handles. Series 7 uses only the highest quality raw materials and enjoys hand made manufacture by our brush makers with years of experience. For larger sizes, each brush is packed into an individual box with a tag included to indicate the name of the Series 7 brush maker who made that particular brush.