Irwin Strait-Line Yellow Lumber Crayon is designed for durability and versatility, measuring 4-1/2 inches in length. This crayon features a tough compound that provides waterproof marking and ensures long-lasting use. It performs well on a variety of surfaces including oily, slick, wet, cold, or dry conditions, making it i for marking wood, concrete, metal, rubber, plastic, cardboard, and ceramic. The crayon is wax-based and nontoxic, providing a safe and reliable marking solution for various applications. Model Number: 66406