Been using these type (Phone China marker) to mark on steel and some other surfaces. But these aren't ideal (not sure if they're just not well made any more or what), but difficult to sharpen and
Irwin China Marker, Black - 2 count
Versatile Surface Marking: These Grease pencils excel at marking on a variety of surfaces such as glass, plastic, metal, ceramics, and even oily or greasy materials. Whether for labeling, sketching, or industrial applications, they offer reliable and easily visible marks on different materials. Precision and Control: The high-quality wooden casing of these Grease pencils ensures a comfortable grip and precise control during writing or drawing.
KALOUR 16 Pcs China Markers Grease Pencils - 5 Colors - Marking on Smooth Surfaces Like Glass, Cellophane,Vinyl,Metal,Ceramics,Plastic,Wood,Fabric
Grease pencil - Wikipedia
Assorted Color Peel-Off China Markers Grease Pencils Set Colored Drawing Marking Crayon Pencil for Coloring Drawing Marking on the Wood Garments Metal Fabrics Porcelain Film Paper Pack of 9
itechpanda 24 Colored Pencil, China Markers Grease Pencils Crayons for Metal Construction Worker Woodworking Welding Marking Tools, Coloring Pencils
Tinlade 36 Pcs Peel off China Markers Grease Pencils for Mechanical Wax Pencil Marking Crayons for Vinyl Metal Wood Paper Fabrics Leather - Yahoo Shopping
Waterproof and reliable: these peel-off china markers are made of quality wood and wax material, non-toxic and odorless, safe for your use, water
Outus 24 Pieces Peel-Off China Markers Grease Pencil Crayons Colorful Drawing Marking Wax Pencils for Wood, Glass, Garments, Metal, Fabrics
10-pcs In Different Color Peel-Off China Marker Grease Pencils
China markers / grease pencils
China Marker Multi-Purpose Grease Pencil-Black
12pcs/Box Peel Off China Markers/Grease Pencils for Glass,Cellophane,Vinyl,Metal,Clothing Industry School Office Supplies - AliExpress
Art Tip: China Markers/Grease Pencils