Durable material - The parallel patch work wheel uses high quality plastic material which is durable, beautifully designed and finished with a smooth surface that can protect your hands. Main function - can be used for paper or a stencil less than 0.6 mm thick. You can use the pen to draw beautiful sewing lines, whether curved or straight, along a model or pattern.4 sizes - About 3 mm / 0.1 ", 5 mm / 0.2", 7 mm / 0.3 "and 10 mm / 0.4", 4 of each size can meet different needs sewing.Easy to use - Just set it up with the properly installed loading feet and follow the model for a magnificent mosaic pattern.Good Couture Assistant - An essential to copy drawings or alignment brands, the best sewing tool perfect for leather, paper and fabric.