Earring Bell-Shaped Backs Recommended for those who have lost them or want spares. These are high-quality backs with bell-shaped silicone, mainly used by high-end brands. They fit well when worn and viewed from behind, so I think they are backs that won't interfere with the design of the earrings. Since they are silicone-filled, there's no worry of losing them. The thickness of the post is also unrestricted with silicone. Simple shipping. Material: Silver 925, stamped High-quality silicone-filled backs Quantity: 2 Available for immediate purchase. Price is for 2 pieces. Material: Silver