This Martelli strip ruler has outside dimensions of 4 1/4" and 30" and cuts 1/2" and 3/4" inch wide strips. Martelli rulers are known for their no-slip capabilities and are extremely popular with the University of Sewing team.
This ruler is 100% accurate for strip cutting because there is no wiggle room for your cutting blade to move. The non-slip material on the bottom of the ruler holds fabric in place as you cut, preventing re-cuts and wasted material. Martelli rulers are constructed of durable plastic to prevent chipping or cuts into the ruler itself and are cut on a CNC machine to ensure 100% accuracy.
For more information on Martelli Rulers and how they work check out this link https://youtu.be/G-uuARJbq9E