Princeton Imperial, Synthetic Mongoose Brush for Oil & Acrylic, Series 6600 Bright, Size 0 Synthetic mongoose performs beautifully Excellent with all viscosities of oil paint Perfect for blending Features a comfortable touch handle The bright has a tighter blend of filaments and is a shorter length than the flat shader, offering greater precision and control for blending; creating sharp edges, choppy fur, and feathers; and fitting into tight spaces.