Thank you Paper Princess! You offer more clarification than my printed pattern does! Only in tiny print at the bottom of the cover page of my pattern does it even say anything about Bloc Loc rulers. It does say the 3" Kite in a square ruler and then I think those pieces also have a sew and flip end attached. The adjoining units of the block are made using the half-rectangle triangle ruler. In the fabric cutting directions is says to cut the fabric rectangles 2.5 x 5", but no where does it say what size you are to trim them to after you sew? Only other clue is the whole block is supposed to measure 9.5" and I can see the drawing shows there are 9 units sewn together. I don't mind buying the rulers, but the pattern seems to be sparse on directions....or I could be sparse on brain matter. LOL