IRWIN Tools STRAIT-LINE 65207 Permanent Marking Chalk， 2.5-pound， Black (65207)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Marking chalk marks are temporary. Provides greater visibility in standard lighting conditions.</li><li>Durable formula is weather-resistant and suitable for interior or exterior use.</li><li>Use to show layout changes and corrections on metal， concrete， lumber， plastic， cardboard and other surfaces.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41J9C9014NL.jpg" noproxy>