This is a proc that is gained from having the 2 items in set. It in increases your ranged and melee attack power by 300 for 12s. It also changing your character model into a tiger for those 12s/
Someone needs to figure out a quest to upgrade these to endgame with each new expansion. Hell, the drop rate can stay the same for all I care.
Ok, dam near useless for warriors now with dual 2h weapons and whatnot. Enhancement shamans and rogues, twinks only. Gotta be one of the rarest twink sets in the history of the game. Dual-wielded Might of Menethil excluded.
I have these on my warrior. Using abilities cause cool animations. Here is a video of my warrior casting bladestorm during the proc. http://www.youtube.com/watch?v=-vMedGNg9O8 Fist Proc Vid
I recently got both of these in a single Zul Gurub run. Lucky me, eh. Too bad I was looking for the tiger mount, not the tiger fist weapons. Anyway, it seems to have a fairly low proc rate, it typically takes me 4-5 full Slice and Dice & rupture cycles to get it to proc. However, the transformation is very cool good to have on you for RP gear, etc.
Used to use these in AV while twinked at 60. The proc carries with it a hidden stun affecting not your target, but the person playing your target. People see you transform into the Tiger boss and just stand there wondering what's going on, often times not releasing after you kill them.