Chrysmela Catch Hypoallergenic High Tech Earring Back (Japan Import) The Most Secure Earring Back that protects earrings from falling off. As seen on People Magazine and TODAY show. Hypoallergenic. Surgical stainless internal mechanism. The platinum and gold coatings do not contain nickel. Perfectly smooth finish. Replaces La Pousette, French, butterfly, friction and other types of conventional backs for straight post studs and chandelier earrings. Patented in the US (8424174B2) and Japan (4560588). Lock and unlock precision technology protects your earrings. Each pair comes with a brochure and a serial number. Available in Platinum, 24K Yellow and Rose Gold to match and fit all your favorite earrings. Comfortable to wear.