This brush has 0.016" Stiff Static Dissipative Nylon Bristle with a Static Dissipative 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". It can be used for cleaning or scrubbing applications in confined, static-sensitive areas. The handle is no more than 3/8" wide at the brush end. This brush can safely remove surface charges without harming sensitive electronic components provided that the operator is properly grounded. Autoclavable for cleanroom or sterile applications. For a medium-stiff static dissipative Nylon bristle brush see part # 33S9X.