The Pica 591/44 Yellow Marking Crayon is a jobsite marking crayon for layout, rough marking, and material identification. This is a marking crayon designed for industrial marking and carpentry layout work. Model Number: 591/44. If you need a mark that stands out better than graphite on rough stock or construction materials, this is the kind of crayon made for that job.

This crayon is built to mark on more than just clean wood. Based on the source data, it is suitable for wood, metal, stone, concrete, and plastic, which makes it useful for framing, masonry layout, shop work, and general construction punch-list marking. It is also intended for use on dry and wet surfaces, so you are not limited to perfect conditions.

The body uses an 11 mm diameter, 110 mm length, and a hexagonal shape. That matters because a thicker crayon lasts longer in rough use, and the hex body is easier to grip and control when you are marking across textured material. The source data also calls out high breaking resistance from its extruded, compacted material, which is exactly what you want from a crayon that may live in a pouch, toolbox, or truck drawer.

One of the key reasons to buy this model instead of a generic lumber crayon is system fit. The Pica 591/44 is specifically designed for the Pica Classic 588 holder. If you already use that holder, this gives you the correct fit and a more controlled way to make consistent marks without fumbling with short or worn-down crayons by hand.

There is also a practical cleanup benefit here. The source data notes that marks can be removed with a damp cloth when necessary. That can be useful for temporary layout work, color coding, or visible marks that need to come off after installation or fabrication.

This marking crayon makes the most sense for tradespeople and serious DIY users who regularly mark rough materials: carpenters, masons, remodelers, installers, and shop users working across mixed surfaces. If you need a bright yellow industrial crayon that fits the Pica holder system and works beyond plain lumber, this is a straightforward, purpose-built option.

Pica 591/44 Yellow Marking Crayon Keeps It Simple and Useful

If your work bounces between lumber, masonry, metal, and plastic, this is the kind of marking crayon that earns a spot in the pouch because it is built for rough materials and real jobsite use.

• Who it's for: Contractors, carpenters, masons, and anyone doing layout work on surfaces where pencil lines do not show up well.
• Why it stands out: It fits the Pica Classic 588 holder, works on dry and wet surfaces, and uses a thick hex body that is easier to control.
• Worth knowing: The holder is a separate system component, so this makes the most sense if you already use or plan to use the Pica Classic 588 setup.

• What materials can this crayon mark on? Source data lists wood, metal, stone, concrete, and plastic.
• Can it be used on wet surfaces? Yes. The source data states it is suitable for both dry and wet surfaces.
• Does it work with a holder? Yes. It is designed for use with the Pica Classic 588 holder.
• What size is the crayon? The source data lists an 11 mm diameter and 110 mm length.