<https://www.superflies.com/products/billy-butt#product>
<http://schema.org/description>
"Another Kola Peninsula household name. Billy Butt is one of those must-have \"black and oranges\" that you need to have in your arsenal in Russia and many parts of Scandinavia. Size 4 tied on a VMC 9909 double hook and size 6 on a Mustad DL71U hook."
<https://www.superflies.com/products/billy-butt>