Zweigart base. This is sold in quarter yard increments -- purchase one for a fat quarter (roughly 18 by 27 inches.) Purchase two for a fat half (roughly 27 by 36 inches). Purchase four for a full yard (roughly 36 by 55 inches. As hand-dyed fabrics can shrink a little in the process, the count can be a little tighter, and your piece may be a bit smaller.