Aqua Flies says this about the rig kit:
We have felt for a long time that steelhead flies with trailing loops need another style of rigging. Wire tends to be stiff and can become compromised if hitting rocks. Braids are too flexible and soft, causing the hook to foul on the fly or leader.
The Ultra Rig is a new style of rigging that remains flexible, even in freezing conditions, but is stiff enough to keep the trailing hook in place. This rigging system is super durable — we use 50 pound spider wire threaded through a soft tubing. The hook is fixed in the perfect location in the fly to maximize ideal hook up with excellent flexibility. The Ultra Rig also will allow the angler to position the hook by simply turning the hook in the tubing. The hook can easily be replaced by pushing the tubing up the hook bend enough to release the girth hitch.
Each kit contains:
• 10 AquaTalon Hooks, size 2
• 10 Aqua Flies Shanks
• 5 feet of 50 pound Spider Wire
• 2 feet of Ultra Tubing
The Ultra Rig Kits are available in six sizes:
Round Eye Kits - 26mm, 33mm, 51mm
Return Eye Kits - 27mm, 43mm, 51mm