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
Tinlade 36 Pcs Peel off China Markers Grease Pencils for Mechanical Wax Pencil Marking Crayons for Vinyl Metal Wood Paper Fabrics Leather - Yahoo Shopping
Grease Pencil– Tare Market
Assorted Color Peel-Off China Markers Grease Pencils Set Colored
China markers / grease pencils
GENERAL PENCIL-Paper Wrapped China Markers. Just pull the string and unwrap as much lead as you want. China markers are perfect for writing on cellophane, glass, acrylic, plastic, metals, acetate, china, coated ceramic and just about any other non-porous surface. This package contains two markers: one black and one white. Made in USA.
General Pencil China Marker Multi-Purpose Grease Pencils, Black/White - 2 count
Paper wrapped pencils, pencil talk
GoldStar China Markers Peel Off Grease Wax Pencil
12pcs/Box Peel Off China Markers/Grease Pencils for Glass
simple stuff: china markers. – Reading My Tea Leaves – Slow
China Markers, Bullet Tip, Black
Milk storage hack - china marker/grease pencil : r/NewParents
Sharpie Peel-Off China Markers