This double-ended applicator brush has 0.016" anti-static, static dissipative Nylon bristle. One end has a flat trim and the other end has an extra-stiff chiseled trim. This brush is manufactured using strong mechanical clamping for maximum fiber retention, and is adhesive-free to prevent contamination on surface areas caused by leaching. This high quality brush has a trim of 1/4" at the tapered end, and 1/2" at the flat end. For a softer brush within this series using static dissipative Nylon, see part: 1005S9.