This brush has a 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 3 x 11 row configuration, with a 7/16" trim and a brush face of 1-1/4" x 5/16". 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 3/8" wide at the brush end. Autoclavable for cleanroom, sterile, or medical applications.