These bottle cleaning brushes are made with sustainably sourced dried coconut husks for the bristles, a bamboo handle for a comfortable controlled grip, and a cotton lanyard for hanging. Medium stiffness for a deep clean without abrasion, 2"x11" Please note, color and handle may vary slightly, as they are shaped by hand. (For a smaller, wider brush, use the Scrub Brush for Jars). We just added a new variation that has cotton at the tip, to allow for better coverage of the flat bottom of the bottle. It's an inch or two longer.