Isacord Thread is 100% polyester, 40-weight thread ideal for high-quality embroidery projects. Renowned for its exceptional strengthnearly twice that of rayonIsacord ensures smooth operation and reliability. Engineered with optimal elasticity, it supports high-speed stitching without looping or puckering, significantly reducing thread breaks. Each 1,000-meter mini-king spool features a unique snap-down base for tidy and convenient storage.