The thread shrinks but the fabric does not, causing a managed puckering. The resulting wrinkled outcome is beautiful and employs for it are limitless. No Particular iron or needles are required plus the embroidery could be sewn on any kind of embroidery machine. 1 spool per pack. 220 yards/200 meters. https://rubber-covered-yarn47026.fireblogz.com/63607632/how-covered-spandex-yarn-can-save-you-time-stress-and-money