Erasable marks: This thermal erasable pen uses a special thermal material that does not leave dust and water stains, and can be easily removed after ironing without leaving marks. Suitable for sewing, quilting and embroidery markings on most fabrics. Smooth writing: This thermal erasable pen comes with a replaceable refill. The refill can draw smooth lines on most fabrics and easily leave sewing marks. Suitable for a variety of fabrics: It can draw patterns and leave sewing marks on sewing fabrics such as cotton, polyester, denim, silk, etc. Just iron the fabric to remove the mark. Practical sewing tool: This pen is suitable for sewing shops, schools and homes. It is an ideal auxiliary tailoring tool for fashion designers and DIY enthusiasts. Durable and environmentally friendly: The replaceable refill is more suitable for people who sew frequently. 20 replaceable refills can be used for a long time. Suitable for embroidery, patchwork or line drawing markings.