Artis Opus - Series D Plus - DryBrush Expansion Set (5 Brushes)5 NEW Series D PLUS brushes, perfectly presented. Series D+ 5 Brush Set The brand new Series D+ 5 brush set includes 5 brand new Series D sizes, 4 of which fit neatly between our existing sizes (e. g. Small+ is halfway between Small and Medium), as well as an XXL, which sits above the XL, taking the new place of chonkiest brush. These additions in conjunction with the original Series D give you the option to pick exactly the right brush for every