I have very thin hair, and it's been difficult to find a clip that will hold my hair rather than fall out of it. These NAT + NOOR clips I ordered, though bigger than I expected, hold my hair in place with good grip! I like styling the both of them together in a half-up half-down style! Very high quality, and I appreciate the subtle but fashionable touch!
Not sure how they'd do in thicker hair, buttt using more than one of them in opposite directions seems to hold the perfect amount of my hair :)