Features: 1.Adopt high?hardness steel nib, improves the marking effect, durable to use. 2.This white pen refill is suitable for being used on dark color leather. 3.It will disappear when the temperature reaches about 60, and will reappear at ?60. 4.Wide application, suitable for temporary marking on shoes, clothing and leather. 5.Comes with 100pcs pen refills, which can completely meet your needs. specification:Condition: 100% Brand New Item Type: High Temperature Disappearing Pen Refill Shell Material: Plastic Pen Point Material: Steel Color: As picture shown Total Length: Approx. 13cm/5.1in Quantity: 100pcs Uses: Used for temporary marking of shoes, clothing and leather. Use Instructions: 1. This product will disappear when the temperature reaches about 60. 2. Used for temporary marking of shoes, clothing and leather 3. The use of high-hardness steel head improves the marking effect and is durable 4. White is used on dark leather, red, blue and black are used on light leather 5. White will reappear at minus 60, and blue, red and black will reappear at -10. PackageList:100 x High Temperature Disappearing Pen Refill Note1. Since the chemical composition and physical properties of different materials are different, please make a small test before putting it into production. If you find that the effect is not good, please stop using it. 2. After use, please cover the pen cap in time and store in a cool place, avoid direct sunlight, so that the effect is still good next time. 3. This product is only used for industrial production marks, please do not use it for writing, signing and other important documents.