I bought the 30mm hoops in 4 colors with the clasp that snaps into place. I just received them today and my initial impression is that they are cute and a good value however they do run small. I have included a photo of one these earrings (on the left) compared to two other 30mm earrings I have. Im wondering if maybe the 40mm also runs small and is more the size Im looking for. Regardless, they seem well worth the money and I will wear all 4 pairs.