Perfect fit for how I read and mark my spot.  The design allows you to mark down a line text, and they don't move.  Great price point as well.  They are marketed as doubling as refrigerator magnets or paper clips, but aren't well suited for those.  In the former case, the magnets aren't that strong, and in the latter they are designed to clip and hold to one or two sheets max.  But for their primary purpose, I can't ask for more.