Question about Samsung Silicone cover with S-Pen holder

It's included, which is to be expected at this price ;-)

As someone else answered above: the S Pen is included. It's a great combination - S21 U and S Pen! There are many you-tube videos with very good advice. A lot of things are not easy to figure out. For example, you can write directly on the black lockscreen with the S Pen: you can then save it in Samsung Notes. It was only through this that I learned that this also works on S Pen-compatible Samsung tablets such as Tab S6 and Tab S7+.