The Good Measure name represents a high quality and accurate measuring system and the good that comes in the form of a donation to breast cancer research for every Good Measure Ruler sold. Make a difference while making something beautiful. Feel good about your choice to purchase Good Measure Rulers - the only rulers with a cause. The 45 degree Kaleidoscope ruler makes banners, kaleidoscope quilts and quilt blocks. This is a 45 degree Kaleidoscope, so you need 8 pieces, plus 4 corner pieces to make a complete block. Each ruler is labeled with its size or the name of the specific job it does. Good Measure rulers are accurate, easy to read and versatile. Made in the USA!