Walnut Slab Cave of the Mounds 989A. The Length is 102 Inches Long. The Widths are 11, 11, 21, and 10 Inches. Rough thickness of 2.25 Inches. In person sales takes precidence over web sales. Come see the slab in person. The website is updated frequently but there is a chance something online could be sold already. Feel free to email and inquire about specific slabs. Local pickup only, call/email for more information or to schedule.