Review on DjuiinoStar 4" Spinning Top Base, Highly Polished By Hand, -30Cm Focal Length (Single Concave), Diameter 3.9"/10Cm, Thickness 0.55"/1.4Cm, Weight 0.54Lb by Vincent Burton

I got one of those small spinning tops because I guess I am a gadget person. I started looking for a spinning "surface" but everyone I saw had a flat surface. That is fine if you a consistent in getting the top to spin in one space. It seemed like a convex surface would make more sense as it would tend to naturally guide the top to the center of the circle.It took a lot of searching but I am pleased that I found this product. It was just what I was looking for. It and the top sit on my breakfast table where I can set the top to spinning while I am eating. And it does, in fact, tend to direct the top's spinning to the center of the disc.