Our brush strip is available in six sizes, (measuring across the base) we have 2.5mm. 4mm, 5mm, 6mm, 8mm and 11mm with filament sizes from 0.15mm to 3mm depending on the size of strip required. The choice of backing strip is either galvanised mild steel or 304 and 316 stainless steel, the application of the brush strip usually dictates which materials to use.