These permit/bonefish fluorocarbon leaders are stealthy and effective. We tie them with 12 LB or 16 LB class, and they are about 12-14 feet in length. 1 leader per package.
Each leader has a perfection loop at the end of the butt section which will allow you to connect it to your fly line with a welded loop. If you need to shorten this leader, just take some length off the butt section.