Grooved drums are made from high-quality materials such as bakelite, alloy drum, super plastic alloy, and Ni-P alloy. They feature improved groove curves, stable yarn linear density, and perfect molding. The surface is coated with a high-density, low-porosity layer, providing excellent wear resistance, static elimination, and a smooth finish. The Ni-P alloy drums offer superior corrosion resistance, wear resistance, uniformity, and a longer lifespan.