Aurifil Lana Wool Thread #8078 Grey Brown Heather. Large Spool. A little grey and a little brown, this color reminds me of a squirrel's fur! Large spool. 50% Acrylic, 50% Wool 12/2. This thread is perfect for wool applique, whether my hand or machine! The acrylic in this thread gives it strength as it glides through your machine.