Features: This flexible curve ruler used in drawing, painting, graphic and garment design, woodworking and so on. Cm and inch double-sided use: clear caliber for easy reading. Soft and pliable measurements used for any shape and can be adjusted quickly from one shape to another. Fits on drawing board. Professional for measuring length which in curve edges. Easy to use: maximum bend and flexible ability. Specifications: Material: Soft Plastic Color: As Picture Shown Unit: cm, inch Length: 30cm, 40cm, 50cm, 60cm(optional) 30cm/11.81in, 40cm/15.75in, 50cm/19.69in, 60cm/23.62in Weight: Approx. Package Included: 1 * Flexible Curve Ruler Notes: 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 【High Quality Material】: The flexible curve ruler is made of High Quality PVC material, which can be freely bent into any shape, non-flammable, not easily deformed, and durable. 【Double-sided design】: Both sides use centimeters and imperial systems, and the degrees on the ruler are clear and easy to read. Professionally measure the length of curved edges. 【How to use】: When used to draw a free curve, first determine a sufficient number of points on it, twist the snake ruler so that it connects points at different positions, and then use the pen to smoothly draw the curve along the snake ruler. 【Easy to Use】: Maximum curve and flexible ability, easily adjust and maintain any shape without support. 【Application】: This flexible ruler is widely used in art, engineering, design, clothing and other industries. For example, irregular curves such as buildings, roads, and pools in design drawings should be drawn using curved or snake rulers.