Marti Michell Rulers are the perfect tool for quilters. They have smooth edges and are crack resistant. They are also made of clear acrylic, so you can see exactly what you are cutting. My Favorite Log Cabin .625" & 1.25"- Use this ruler to rotary cut squares and strips to exact length for perfect log cabins. Measurements given are finished strip sizes. For making log cabin blocks up to 13 3/4" square. Not only are the measurement sizes printed on ruler by also piece placement diagrams. Also includes a handy instructional pamphlet. Ruler size 3 1/2"x 15".