What is the pigtail loop? What is the pigtail loop? Ceramic pigtail coil is made of ceramic, like line pigtail, so call it pigtail loop, which is used to cross the line. Introduced before the ceramic pigtail loop material is introduced before, certainly the quality guaranteed. We understand the details please visit the company's official website: www.www.pk-kicks.com Source: www.www.pk-kicks.com (forward please specify forwarding source)