MEGALUXE Welder’s Chalk. Soapstone Pen, Flat White Soapstone Refills, Soap Stones Chalk, Soapstone Pencil For Welders Textile Marking Tools And Markers Removable Markings On Steel Cast Iron. Wide Applications – The Soap Stones Chalk Perfect For Welding, Brazing, Cutting, Metal Joining Techniques, Construction, And Etc. OD1047 / SPJ 0018