Apsara Glass Marking Pencils, White - Pack of 10 : Amazon.co.uk: Stationery & Office Supplies
Anand Crafts Wax Based Glass Marking Pencils to Write/Mark on Leather, Glass, Optical Lenses, Metal, Vinyl, Cellophane, etc - Set of 5 Pencils : Amazon.in: Home & Kitchen
10 Glass Marking Pencils Leather Metal Vinyl White Blue Red Black Yellow Green | eBay