Yellow Tailors Chalk / Box of 48 Yellow Tailors Crayon Brand New Box of Yellow Tailors Chalk / Tailors Crayon These top quality Tailors Crayons, also known as Tailors Squares, are manufactured in a wax base and special chemical base. They mark smoothly, sharpen easily, and produce clear lines that melt when pressed. Each square measures 45mm X 38mm X 5mm (1-3/4" X 1-1/2" X 3/16") Approximately.