Arteza Acrylic Quilter's Ruler, 2.5"x18" (ARTZ-8129): Clear Design - This Quilters Ruler is transparent and embossed with measurements, including a ½ inch seam allowanceDouble-Colored Grid Lines - Our patented black and lime green grid allows you to easily see the fabric underneath, no matter the colorDurable Acrylic - Designed to last for all your sewing, quilting and craft measurementsAmbidextrous Angle System - Angles are vertically mirrored to make it easy for left and right-handed crafters to use the ruler Arteza makes art supplies affordable to creators with every budget.