Featuring Airflo's classic Delta Taper, this line is great for casting teams of flies at long distances with minimal disturbance - even on slick days. The Stillwater's Power Core is essential for feeling the slightest line lift, no matter how far out there your flies may be. Looped at both ends and printed. Featuring Airflo’s classic Delta Taper, this line is great for casting teams of flies at long distance with minimal disturbance — even on slick days. The Stillwater’s Power Core is essential for feeling the slightest line lift, no matter how far out there your flies may be. Looped at both ends and printed.