These are great little 4mm sterling silver knot earring studs that can be used for all purposes yet will still look dressed up. The design dates back to the times of Alexander the Great and the tale of the Gordian knot. Nickel and Lead Free, Non Allergic. 925 Sterling Silver Small studs, great for sleepers. All purpose but distinctive Small in size, big in design. Dimensions: Length=4mm, Width=4mm