Scientific Anglers Absolute Fluorocarbon Shock is a saltwater shock tippet for the business end of heavy leaders. It’s 100% fluorocarbon, with an emphasis on clarity and abrasion resistance when flies and fish get close to structure, teeth, or rough mouths. Scientific Anglers also lists 15% higher wet knot strength.
Across the sizes, you’re mainly choosing diameter and break strength: from 25 lb at 0.018” / 0.45 mm up to 80 lb at 0.033” / 0.85 mm. All sizes come on 30 m spools, and the open-hub spool design dispenses cleanly when you’re pulling off longer sections.