"The 'Purdy Pro-Extra Glige' 3 1/2"in my opinion, with 25 years in the trade, is with out a doubt the best cutting brush on the market today. It holds more paint, cuts a finer edge, & cuts a longer line than any other brush I've ever used. This not only means, not only, I can create cleaner cuts, but it can be accomplished much faster. The bristle composition allows the perfect cross between open softness to hold the paint and stiffnes to hold the line and retain it"s shape. Perfect for muli-prduct & base application."