During polymer melt extrusion from a circular nozzle. the extrudate at low flow rate shows a stable linear shape with smooth surface but the extrudate at higher flow rate shows unstable shapes with spiral. rosary. or zig-zag structures. https://www.bekindtopets.com/mega-save-Mama-Baseball-Rainbow-Unisex-Poly-Rich-Blend-Tee-great-pick/