I will quote the product description from the AI: This is a Clover "Seam Allowance Liner" set. It's a tool for neatly drawing parallel seam allowance lines along patterns and templates. The set includes four liners with widths of 3mm, 5mm, 7mm, and 10mm. It's also suitable for curved patterns and is convenient for techniques like applique and Hawaiian quilting. It can be used with patterns and templates up to 0.6mm thick. The material is ABS resin and made in Japan. This item was used at home. Please check the photos before considering a purchase. Thank you for looking.