Features: 1.Marking pen refill's marking line will disappear immediately while its temperature gets to 60. 2.Used for temporary marking of shoes, clothing and leather, fabric marker pen refill keeps exquisite craftsmanship. 3.With high hardness steel tip, marking pen refill's marking effect can be improved, durable. 4.And white will recolor at minus 60 , while blue, red, and black will reappear at around minus 8. 5.Furthermore, white is used on dark leather, red, blue and black is used on light leather. specification:Item Type: Fabric marker pen refill Color: White / Red / Blue / Black (optional) Quanity: 100 x fabric marker pen refill PackageList:100 x Fabric Marker Pen Refill Note1. Due to the different chemical composition and physical properties of different materials, please do a small test before putting into production. If you find that the effect is not good, please stop using and contact us. 2. After use, please put on the pen cap in time and keep it in a cool place to avoid direct sunlight, so that the future use effect is still intact. 3. This product is used for industrial production marking, please do not use it for writing, signing and other important documents.