Amazon.com: ARTEZA Quilting Ruler, 6" Wide x 6" Long and 2.5" Wide x 18" Long, Laser Cut Acrylic Quilters' Ruler with Patented Double Color for Quilting, Sewing & Crafts
Amazon.com: Arteza Quilting Rulers Set of 4 - Double-Colored Acrylic Sewing Ruler (4.5"x4.5", 6"x6", 9.5"x9.5", 12.5"x12.5") with Non-Slip Rings, Essential Sewing & Quilting Supplies for Clear, Precise Measurements