a297ca5f_r_s_Corner___Choosing_a_Leader__5
[0] Mirage Leader and Tippet Combo Pack [1] 9' [2] 100% Fluorocarbon (PVDF) [3] 3X-6X [4] Anywhere you'd use a Mirage leader but want the convenience of a loop-loop tippet connection instead of tying knots. [5] 
A convenient and economical way to get a Mirage leader and the correct tippet size. When your tippet gets too short and heavy, just tie on a new section from the included spool.
Fly Fishing - The Beginner's Corner - Choosing a Leader
5