Silicone Earring Backs: Silicone earring backs are made of soft silicone, soft and durable to wear comfortably. Available in 6 different sizes, they can be used with any earring. The earring safety backs come in a sturdy and delicate box with approximately 550 pieces, arranged in small compartment holes according to size. The earring safety backs fit very snugly on the earring wire, making them very easy to use and just the right size to prevent slipping off and losing your favorite earrings.