Product Details 4mm Synthetic Opal Threadless Flat Back Earrings Check out these super comfortable 20 gauge flat back earrings for 24/7 wear. No need to take these earrings out; keep them in for sleeping and naps. These threadless push in flat back earrings are designed for comfort and style, the push-in feature ensures a secure fit with easy insertion. They're made with 6mm durable 316L surgical grade stainless steel straight posts with a flat disc end. They feature synthetic opals for a look that's both timeless and trendy. You'll wonder how you lived without this whimsical floral ear piercing jewelry. Sold as a set of two. Specifications 20 Gauge (.8mm), 1/4" (6mm) , 316L Surgical Grade Stainless Steel Straight Posts, Synthetic Opal, Threadless Push In, Sold as a Pair