Preston Innovations Magnitude Spare Spools are CNC machined from aluminium and come with a dual line clip as standard, so you can switch between fishing at different ranges without re-rigging. They are a practical option if you want to carry spare line and swap it quickly onto your reel. - 320 Size – Capacity 0.23mm/150m - 420 Size – Capacity 0.26mm/150m - 520 Size – Capacity 0.28mm/150m