The raw materials for nylon grinding brush rollers include DuPont filament (Tynex612) with abrasive filaments, ordinary pure nylon filaments, and other plastic filaments such as PP, PE, PBT, aluminum, stainless steel, and XI quality cores. These materials are processed to produce brushes that have strong grinding power, a long lifespan, and low cost. They perform excellently in the grinding processes of single, double, and multi-layer PCBs, but they have a significant price advantage over similar imported products.