These are inexpensive clear acrylic stand, these stands are not expensive and allow you to display a tooth upright, but are often not large enough to make sufficient contact with larger megalodon teeth.
The teeth pictured are obviously not included but included as a size reference.
These stands are only available when purchasing teeth as I offer them as a budget option for customers but am not interested in getting into the stand business.
These acrylic stands will work for some sizes of megalodon teeth and do a good job at not distracting from the fossil, but as they are made of inexpensive acrylic can somewhat detract from the tooth they are displaying.
These acrylic stands have shortcomings because they were not designed for megalodon teeth, but simply used as a tooth stand because no other good options were available.
I suggest the wood and metal stands for megalodon teeth but these can be used on smaller teeth.