Its Sew Emma - Triangles on a Roll 1in Finished Half Square Triangles
ISE H100 replaces H100 Makes 1200 1" 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 8.25" wide.