This soft insulative brush has 0.003" Soft Nylon Bristle with a Delrin (Acetal) handle. The Nylon fill material is hand-laced with Nylon twine 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 cleaning, scrubbing, wiping or dirt removal in delicate applications. These brushes can be used in an anti-static environment when submerged in liquid. Autoclavable for cleanroom, sterile, or medical applications. Meets FDA 21 CFR 177.2480 and ASTM D6100 standards. For a stiffer Nylon bristle see part # 33ND.