A next-generation mayfly pattern enhanced with a hareâs ear blend and an Evolution Mayfly Clinger & Crawler beadhead. This Fly Tying Kit contains everything you need to tie 8 Clinger Nymphs, including step-by-step tying instructions. Included Materials: Nymph-Head Evolution Mayfly Clinger & Crawler tungsten beadheads, Kona Nymph Streamer 2XL (NS2) hooks, Hareline Hare nâ Ice Dubbing, Natural color, Pheasant Tail, Lead-free wire, Gold ribbing wire. Not included: Thread, glue, fly tying tools.