18k yellow gold, stainless steel ball bearings. 2.25" long
 
The ball bearings in these earrings are set tightly enough to remain secure, but with enough space to freely spin. Delightful for us fidgeters!
The tension of these earring wires is designed so you can keep them on without the need for an additional security earring back. If you decide to open them up a bit, make sure to add a little rubber stopper to avoid any mishaps.