Walnut Slab Cave of the Mounds 990F. The Length is 113 Inches Long. The Widths are 12, 17, 16, 16, and 19 Inches. Rough thickness of 2.5 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.