Markal Timberstik®+ Pro Grade Lumber Crayon – Green The Markal Timberstik®+ Pro Grade Lumber Crayon in green provides bright, durable marks for construction and survey applications. Designed for use on rough materials, it ensures dependable visibility in the field. Key Features • Green marking for visibility on multiple surfaces • Works on wood, concrete, metal, and stone • Durable crayon resists breakage • Reliable in wet, dry, and cold conditions