Set contains flying geese 2" x 4" finished (2 1/2" x 4 1/2" trimmed) and 3" x 6" finished (3 1/2" x 6 1/2" trimmed) rulers. Groove locks onto seams for instant & correct ruler placement, control so that the seams end in each corner and trims the correct amount across the tip. Ruler rock is gone, too. Trims full and partial flying geese, parallelograms, square in a square and many. many other types of flying geese.