Lox - Safe and Secure Wear and celebrate your precious earrings without the fear of losing them and the special memories they hold. The only product of its kind.Lox’s unique secure earring back technology gives you the confidence to enjoy your earrings wherever you go. Lox locking earring backs have been tested to simulate over 50 years of daily use. That’s why Lox come with a lifetime guarantee on their manufacture and materials. Secure earring back that will not loosen over time.