Marks can be easily wiped away with water, ideal for quality control and temporary marking needs. Great for many surfaces including smooth, rough, rusty, or dirty surfaces. Marker refills eliminate mess and paper waste of grease pencils, saving time and money. Durable plastic holder helps prevent breakage and keeps hands and clothing clean. Push-button advancing makes for easy, one-handed use. Convenient clip allows for pocket storage and prevents rolling off work table.