Leaderboard

Depends on what you want from the rig, and what lead system you'll be fishing it with. A lead clip system with an anti tangle sleeve and tubing over the swivel and something like 12lb flourocarbon mainline or even a semi-stiff coated braid will sit and reset just fine. If you're fishing it on a heli lead or something with more in-tubed swivels or loose movable points you may want a stiff coated braid or a thicker flourocarbon hooklink material to guarantee the boom will kick out straight on the cast and after a pick up. I would be thinking "what do I want the rig to do in the water, and what will make it do this or not do this" rather than just "what material is commonly used." Also, use a different rig altogether if you want the same effect but the conditions aren't right for it. A variation that has a similar effect that I use a lot is a multi rig made from soft coated braid with the entire single strand section stripped and a small loop for the hook. The double coated section acts as a chod rig, and the rest acts as a supple boom link that will still kick out if a lead isn't dragging it down but will lay over anything. This on a heli lead system will fish over pretty much anything. On a hard bottom I'd want a stiffer boom and a lead clip. Depends.

Ok I need to read slower! Are you saying what stuff to buy or what can be used? If it's what you've already got go for the stiffest stuff you have, personally I wouldn't be confident that standard mono off the reel would be stiff enough