Krystal Core Leech Yarn! Krystal Core Leech Yarn is the next step in mohair leech yarn, this special blend comes with a core like no other. It has a Flat Braid for a core adding an impeccable shine to be base of your fly. Whether youre tying leeches, buggers, under bodies on articulated streamers or steelhead flies this product is going to be a staple on many shop walls. With a 16 color range to start Krystal Core Leech Yarn has a lot of potential to expand in colors and uses. We are loaded up on our quantity of this one as we know it will be a favorite in your own fly tying collection. Each package has 3 yards of this amazing product.