Long Side: 5.784 Inches. Short Side: 5.689 Inches. If, you ask a question, it may be up to 72hrs before I get back to you, because I will have zero access to phones or computers while on the Ocean.Those 6 months of the year are my "Off Season". Any questions, please don't hesitate to ask. This item is in the category "Collectibles\Rocks, Fossils & Minerals\Fossils\Vertebrates\Shark Teeth". The seller is "fossilquest" and is located in this country: US.