The New PR Bobbin from Shimano is strong, lightweight and simple device that is able to achieve stunning PR knots and binds with ease. It comes with a built in line tensioner as well as double O-rings to lock in your braid, preventing slippage during your winding. It also features a hard zirconium ring at the tip that reduces heat and friction by allowing the braid to run smoother under tension.PE: 1.5 – 8Weight: 57grams