Triangles on a Roll 5-1/2in Finished Half-Square TrianglesTriangles on a Roll 1 2in Finished Half Square Triangles Makes 188, 5. 5in finished half square triangle blocks. Triangles on a Roll triangle paper allows you to create perfectly accurate half square triangle units in any size and amount you need for your next quilt. Unroll and cut just what you need, then roll it back up for easy storage. Directions call for fabrics to be cut 7in wide. * Color: White * Made of: Paper * Use: Papers to make Half Square