1、Used to mark grid on the dark embroidered cloth, and then use the electric iron to heat it up after the embroidering. It is different from ordinary ordinary powder. The surface is treated with special coating and it is not sticky, and it is harmless to t 2、The chalk has gasification, and the trace disappears after 72 hours of use. 3、Gasification time can be adjusted according to the strength of the line; (48 hours - 168 hours). 4、The surface is treated with a special coating and is not harmful to the human body. 5、Designed according to ergonomic principles, the use is more convenient. Features: Used to mark grid on the dark embroidered cloth, and then use the electric iron to heat it up after the embroidering. It is different from ordinary ordinary powder. The surface is treated with special coating and it is not sticky, and it is harmless to the human body. The powdered lines are softer and more vivid. The chalk has gasification, and the trace disappears after 72 hours of use. Gasification time can be adjusted according to the strength of the line; (48 hours - 168 hours).  The surface is treated with a special coating and is not harmful to the human body. Designed according to ergonomic principles, the use is more convenient. The lines of the powder are softer and more vivid. High-density manufacturing process, low wear rate and more durable. There are no traces on the paint, the strength is enhanced, and it is not easy to get broken. Package List: 50 x Chalk Note: Even if it is broken into several parts, it can be used. Don't throw it away. Unless you have already used it, it is recommended that you take it home and try it out! Especially some ultra-thin coated fabrics or fabrics that are easy to reflect!