The Princeton Aspen 6500 series is an artist-grade, medium stiffness synthetic brush for acrylic and oil painting. Aspen has superior shape retention through lots of painting and washing, so you have more control over your brushstrokes. The matte black handle and ferrule are ideal for plein air painting because they don't reflect sunlight—plus, it just looks great. If you've been thinking of upgrading your acrylic or oil brushes from student grade options, Aspen is a great pick. If you want something a bit stiffer, consider Princeton Catalyst Polytip, another excellent synthetic from the same manufacturer.