This brush has 0.003" Stainless Steel Bristle with a Delrin (Acetal) handle. The stainless steel fill material is hand-laced with stainless steel wire into its handle for maximum fiber retention. This high-quality brush has a 2 x 11 row configuration, with a 7/16" trim, and a brush face of 1-1/4" x 1/4". 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 5/16" wide at the brush end. Autoclavable for cleanroom, sterile, or medical applications. Meets FDA 21 CFR 177.2480 and ASTM D6100 standards. For a larger stainless steel brush see part # 33SSD.