The inner hole diameter of the circular ring is 4cm, and the outer hole diameter is 6cm.

Different curtain widths result in a different number of circular rings. You can contact us and provide the desired curtain style for us to check.

The translucency on the top and sides is related to the installation method; the farther it is from the window edge, the harder it is for light to pass through.

It is the distance from the top to the bottom.

No.

Different curtain styles can be used with curtain hooks, and we will specify this in the product description.

There are single panel and 2 panels, and the product description provides information on single and 2 panels.

100% blackout curtains have a liner.

No.

Yes.

100% blackout curtains have better soundproofing compared to other curtains.