The black refill is made of carbon fiber and is designed for heavier dirt.
Fibreglass Woven Cloth Tape 175g/m2 Choose SIZE & LENGTH - Use with Fibre Glass
Uni Posca Paint Marker Pens Fabric Glass Metal Pen PC-5M
Ceramic Fibre Microwave Kiln Glass Fusing Paper for Glass Craft 1mm thick
Leather dye touch up pen scratch repair dauber, colourant restorer dabber kit.
Heavy-Duty Magnifying Glass with Light 3X & 45x Magnification Scratch-Proof Lens