Whether you're planning to be on the go at work, or dancing the night away, you can be sure that these hoop earrings will stay in place thanks to their secure, push-button, hinged design. The 3mm wide square tube hoops have a 30mm diameter and an 11mm long pin. This pin clips into place at the top and is released only when you press the tiny button at the back of the hoop. This pair is made from gold plated sterling silver, but other metal options are available. They weigh 6.4 grams for the pair and carry a 925 mark.