Heavy‑duty sharps needles for thicker fabrics. The slightly rounded point provides versatility while the larger 100/16 size pierces medium‑to‑heavy wovens cleanly for durable seams and topstitching. Works with most home machines and common threads including polyester, cotton and silk. Choose needle size to match fabric weight for smooth stitching and minimal puckering. Pack contains four 100/16 needles.