Avid Carp Weigh Sling, A strong and secure weigh sling for big carp. After speaking to various fishery owners, Avid Carp concluded that zips on weigh slings can cause various problems. Trapping a carp's tail or fins can cause major damage. After careful consideration, Jon 'Shoes' Jones decided to use Magnet Technology on the Weigh Sling. This totally eliminated the need for zips and create a super-safe sling!