Made using  special nonslip splices from heavy duty 650lb Dyneema braided cord (approximately the same thickness as 250lb Dacron). These wind-on’s will fit through most rod guides, and take up very little space on the reel. They don’t stretch and have very good abrasion resistance. They last a lot longer than standard Nylon/Dacron wind-on’s. Proven on thousands of big game captures, including multiple world records. Standard length is 5.8-5.9 meters. Can be made to any length by special order. Please enquire Also available separately: Red Gill Heavy Duty Stainless steel (black anodized) ballbearing  400lb Tournament Snap Swivel. $10.00 (pictured) NOTE:  Please always check your leader and wind-on combined length is no more than 30 feet or 9 meters, we prefer to make it 8.5 meters to allow for any stretching of the mono when catching a large fish.