Designed for optimum strength and casting distance Filler spools Designed for optimum strength and casting distance. Smooth for long and quiet casts 0.06 mm class 0.002 in class 6.4 kg 328 yd 300 m Designed for optimal strength and casting distance. Smooth for wide and quiet throws. The Berkley x9 braid is a braided cord made from 100% PE fibres. 8 braided fibres are widely used. Berkley x9 takes it to a new level by adding an extra fiber. The x9 is therefore extremely strong and tear-resistant and made to be supple and therefore can be thrown effortlessly and far.