A wonderful fly tying material for one of the all-time great trout, steelhead and salmon flies - egg patterns. McFly Foam is a unique material in that it almost looks as if it is spun, like fiberglass. Because of the unique structure of the fibers, McFly Foam flares exceptionally well with a minimum of material and is the best material for perfectly round eggs patterns. 3-1/2'' x 6''. Great for tying egg patterns Unique structural fibers Makes perfectly round eggs