Crayola-Power Lines Project Markers. Great for school projects, colorful signs or doodling, these scented markers have special tips that allow you to make thick or thin lines. Washable. This package contains ten 5-1/4 inch long power line project markers in scented and vibrant colors. Recommended for ages 3 and up. WARNING: Choking Hazard- small parts. Not for children under 3 years. Non-toxic. Conforms to ASTM D 4236. Imported.