Review (3/5): Not for thick hair
These are definitely not for thick hair. Only a small amount of hair can be clipped into these clips because of the design. The duck bill fits tightly together when there is no hair in it, so anything other than a small amount of hair will not allow the clip to close and it won't hold your hair.
The flowers on the clips may have some satin underneath the rhinestones, but if you're looking for satin hair clips, these probably are not what you're looking for. There is no visible satin on these clips.
They're a little difficult to get out of your hair. My hair got tangled in both the duckbill clip and the smaller flower clips when I tried to remove it. It is probably easier to have help when taking it out of your hair. The small clips do hold hair pretty well though.