Is that grade 120 chain? /forums/images/graemlins/shocked.gif
If so, I bet it cost you an arm and a leg. Well worth it if you skid a lot of logs though.
I always wanted some real skinny high alloy chain, case hardened if possible, around 7/16 or 1/4". Although skinny, the best alloys could be almost as strong as 5/16" grade 43 or 70, which are slightly over kill for me. That way, a 20 footer fits neatly in a small can, and doesn't weigh a ton.
The only real good chain I have is a 6' piece of 1/4" case hardened grade 80 choke chain, and I am very attached to it.