This brush has 0.012" Nylon bristle with a hand-laced aluminum handle. The Nylon fill material is hand-laced with stainless steel wire into its handle for maximum fiber retention. This high-quality brush has a 3 x 11 row configuration, with a 7/16" trim, and a brush face of 1-1/4" x 5/16". These brushes are popular for detail cleaning on items such as printed circuit boards and SMT assemblies, or for use as fluid applicators. For a smaller Nylon bristle brush see part # 11NA or # 22NA.