It is a curved ruler used by tailors. It is used mainly in the sewing room. Keep away from children and under age.It is versatile. It can be used for all levels of learners.It is made of plastic. It can also serve the purpose of an armhole curve. It is one of the most essential tool for a pattern drafter. It is used in drawing curves around on a pattern. I.e necklines, armhole etc. It can also be used in drawing curved lines on a pattern.It can also be used for contouring.It can also serve as a ruler and A tee square. It is made from acrylic. It is resistant to water.It is a universal tool.It can also be used to draw straight lines.It should be used solely for the purpose it is meant for. Will last longer if handled with care.It is Available in large quantities .