Lee Sin Runes explained
There's one set of runes for Lee Sin on patch
11.19
that is the clear favorite for LoL players and pros alike. The best Lee Sin Runes on the position 
Jungle are Precision as the primary path and
Inspiration as the secondary path with a pick rate of 95%. Besides runes you should take a look on Lee Sin Build and if you are interested in pro matches take a look at Lee Sin Probuilds. If you want to discuss
Lee Sin then you should visit the champion subreddit.
Primary path on Lee Sin
Precision improves attack and sustained damage on Lee Sin troughout the match. Most of high elo players – and our LoL pros in the the major regions – have agreed that
Conqueror is the best keystone rune to run on
Lee Sin. This keystone rune provides additional power in the later stages of a game. As soon as
Conqueror is fully charged, Lee Sin deals additional damage and gains life steal. This is usually followed up by taking
Triumph,
Legend: Tenacity and
Last Stand.
Triumph restores on Lee Sin a part of missing health and award bonus gold, if a champion is killed. Lee Sin gains extra Tenacity with every additional stage of
Legend: Tenacity. With
Last Stand you deal more damage while you are at low health.
Secondary path on Lee Sin
When it comes to your secondary path, most
Lee Sin players prefer to go with
Inspiration.
Inspiration opens creative opportunities on Lee Sin troughout the match. On the
Inspiration path, the best runes for LeeSin are
Cosmic Insight and
Magical Footwear.
Cosmic Insight grants summoner spell and item haste.
Magical Footwear allows players to focus on those essential core items without the need to spend the additional 300 gold on boots.