SMI Crab And Shrimp Trap Rot Cord - Use the SMI Replacement Rot Cord on your crab or shrimp escape panels to allow trapped species to escape from a lost pot. With a 120 or 30 thread size, the cord's 100% untreated-cotton construction degrades naturally in seawater over time. For use on crab or shrimp trap latches or escape panels. 10 feet of rot cord in each package.