Hypoallergenic Detachable Crystal Spike Ear Jackets by Onnea Glamorous, spike-inspired jackets burst with rays of sparkling crystals that illuminate your lobes for any essentials. Add bling to your ear party with these ear jackets! Each gold-tone earring has a piece that hangs behind your lobe and is covered in crystal. Crystal square stud and jacket Size: 20mm*30mm Material: Metal, nonmetal, surface coating testing method with reference to CPSC, and analyzed by AAS.