Light weight all-metal construction, including anodized aluminum caps. No plastic components. Anti-slip surface holds line in place to cinch knots easily. Save your hands from the pain of spectra! 3 lb pulling force from magnets holds rods together during storage. Through hole holds 2/0 - 6/0 J and circle hooks for making knots. Will not rust or corrode. How To Use Wrap your main line and leader or top-shot around each of the rods three times. Make sure your knot is centered between the two rods. Pull apart in opposite directions to cinch.