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It's Sew Emma 3-1/2" Half-Square Triangle (HST) Paper on a Roll #H350

Makes 540 3.5" 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 9.5” wide.