Size: 1/2" X 4-5/8" Marking range: -50°F to 150°F (-46°C to 66°C). * Also known as layout chalk or "keel". * Standard 1/2" hex. shape fits standard lumber crayon holders * Lead-free. * Weather-resistant, fade-resistant marks. * Economical. * Use on cardboard, ceramics, concrete, lumber, metal, paper, plastic, and rubber. * Unit packaging: 12 of one color to a box. $7.56, 6/$38.16, 12/$70.56Color: 80350 White80351 Yellow80352 Red80353 Black80354 Orange80355 Blue80356 Green80357 Pink80358 Purple80359 Brown80362 Aluminum Need more information? Please feel free to contact us at 1-800-592-6940 - Ask for Extension 588 or Internet Sales.