A beautiful and challenging puzzle. The arcs on every piece have the same radius as the outer circle, thus any pc could potentially match along the outer edge or adjacent to any other pc where a concave curve meets a convex curve. But, there is only one solution! Precision cut in our Spring Hill shop with at least 4 different hardwoods contained in each puzzle. The mix of hardwoods will vary, so every puzzle will have a somewhat unique look. Size: 7" in Diameter Please copy and paste the link below into your web browser for a video further explaining this beautiful wood puzzle: http://vzaar.tv/942765