Hunter · Marksmanship · tier 2 · from level 15
Improved Stings
+105 Serpent Sting
3/3 · level 60 · per cast
Improved Stings
Rank 3/3
Increases the damage of your Serpent Sting ability by 20%, reduces the cooldown of your Viper Sting ability by 6 sec, and increases the duration of your Scorpid Sting ability by 45 sec.
Averages, counting crits and misses, for a level 60 Hunter with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.