Our Ultra flexible Chafe tubing is perfect for making loop ends on your leaders! The small size will handle leader material up to 400lbs.. It has an 1/8" O.D. which fits inside the brass tubing in our 7"-11" lures. The large size will handle leader material from 400lbs. to 600lbs.. It has an 5/32"O.D. which fits inside the brass tubing for our 12"-16+" lures.