This brush has 0.003" stainless steel wire with a Delrin (Acetal) handle. The stainless steel wire is hand-laced with stainless steel wire into its handle for maximum wire retention. This high-quality brush has a 1 x 11 row configuration, with a 7/16" trim, and a brush face of 1-1/8" x 1/8". These brushes are great for removing stubborn dirt, light rust or corrosion on detailed parts. This brush safely cleans most tarnished metals, but can leave a dull finish on soft metals. The handle is no more than 3/16" wide at the brush end. Autoclavable for cleanroom, sterile, or medical applications. Meets FDA 21 CFR 177.2480 and ASTM D6100 standards. RoHS 3 (2015/863/EU) compliant.