Does cutting your paper into triangle strips by hand drive you crazy? If you need a little help getting the shape just right, this standard triangle stencil may be just the thing. It has the outline of the three most popular triangle strip sizes at 12 inches long, and a mark at the 6 inch point so you can trace shorter strips as well.
Just draw in the groves and outline the triangle piece on the pack of your paper. Then carefully cut on your drawn lines to make the perfect strip. Keep one hand on the stencil as you draw to hold it firmly in place.
The stencil is made of 6mil mylar and can be re-used over and over. If it gets dirty, just wipe it down with water.