1x empty pen, 10x erasable refills, ample number of mixed colors, can be used for a long for time Blue,, rose red, black, and beige are used for light-colored leather or cloth, and will reappear at minus 20℃ The white pen can only be used for dark leather The white color develops 5-20 seconds after writing, and it reappears at minus 50℃ The high temperature disappearing pen disappears when the temperature reaches about 60℃ Used for shoemaking, clothing, leather, Creative handcraft accidental identification line marking