Pline CXX Leader Material. Sizes 2, 3, 4, 6, 8, 10, 12, 15, 20, 25. Now anglers can have our CXX X-TRA Strong line in convenient stackable leader spools. This leader material has the same great knot strength and abrasion resistance as our entire CXX family of products. You now have more flexibility than ever before to meet the challenge of any fishing condition with a combination of CXX line and leaders.