Scientific Anglers Premium Fluorocarbon Tippet with Interlocking Spool with Cutter Sizes: 7X  80lb. Length: 30m spools in all sizes and 100m spools available in select sizes. 7X - 25lb on small spool; 30lb - 80lb on large spool Hard, abrasion-resistant outside; softer core The ultimate in ultra-low visibility