kastking durablend monofilament leader line - premium saltwater mono leader materials - big game spool size 120yds/110m kastking kastking durablend monofilament leader is formulated to be the most durable and abrasion resistant leader material available today. it is incredibly strong with low stretch and memory. kastking durablend mono leader material has superior tensile strength and abrasion resistance with rock solid hook setting power. available from 20lb to 80lb test.