Product Description Nano Silk is regarded as the tying thread choice of professional fly yers w... Semperfli Nano Silk 30D Bulk 500M at Yellow Dog Flyfishing Browse all Yellow Dog Flyfishing deals $24.66 In Stock at Yellow Dog Flyfishing Price checked 11 days ago Buy Now at Yellow Dog Flyfishing Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Semperfli Semperfli