Perhaps the most well-known of all the Bob Ross brushes, the 2? Background Brush is handy enough to create all of the effects that the 1? brush is used for, and it can also cover large areas very rapidly.
Bob Ross Background Blender Brush - 2 Width
Bob Ross Landscape Brushes Cowling & Wilcox Ltd. - Cowling & Wilcox
Painting Supplies - Wildlife - Ross Wildlife Brushes - Bob Ross Inc.
Bob Ross Brushes Bristle Filbert
BOB ROSS Archives - Page 2 of 2 - THE PAINTBOX
Bob Ross Materials - The Joy of Painting wet-on-wet
Bob Ross Materials - The Joy of Painting wet-on-wet
Bob Ross Landscape Oil Paint and Brushes 27-Piece Bundle, 14x Paint Colors (37ml), 12x Brushes and Painting Knives, 1x Velono Roll-Up Case
Bob Ross Landscape Series Oil Painting Natural Bristle Brushes - Assorted Types