Pre-shaped slabs are a great way to get knapping! Wether you're an experienced knapper or a beginner these 2.5" Black Obsidian preshaped slabs can give you satisfying results much faster with less waste than knapping with traditional spalls or whole stone. We are a small business and shape these slabs right here in the USA. Each piece is carefully inspected for cracks and flaws prior to shipping. Photos illustrate what you should expect to receive, Actual pieces will slightly vary. Available in Quantities of (3), (6) or (10).