Round Clear Acrylic Kolinsky Brush Handle with Silver Ferrule - Beauticom, Inc.
ArtSecret New Arrival 3700 Bright Oil&Acrylic Brush Synthetic Hair Stainless Steel Ferrule Natural Wood Rod Art Tool Supplies|Paint Brushes| - AliExpress
Wire-Tied Quill – FauxBrushes
Gurney Journey: How the paintbrush ferrule got its crimp
Acid/Flux Brushes, 1/2" Wide, 3/4" Trim, Black Horsehair, Tin Ferrule Handle | Bundle of 2 Each - Walmart.com
ARTEZA Arteza Watercolor Set, Brown Brush Hair, Silver Ferrule with Silver Wooden Handle and Black Printing- 12 Pack in the Craft Supplies department at Lowes.com
Paint brushes - Lyons - Round ferrule, short handled - Nr. 10 | Heutink International
Cinghiale Large Professional Round Brush -Nickel ferrule,wooden handle, #22 | eBay
Amazon.com: Yasutomo Origami Brush Hake with Metal Ferrule Sheep Hair 1 3/8" wide