14k Yellow, White or Rose Gold Pair of Push Earring Backing Replacements These push backing replacements are made of solid 14k gold (not plated, bonded or filled) and stamped "14k". If you need new backings for your favorite pair of earrings, these backings come in a range of sizes so they will be the perfect fit. The x-small backings measure 3mm (0.12 in) x 3mm (0.12 in), the small backings measure 3mm (0.12 in) x 4mm (0.16 in), the medium backings measure 4mm (0.16 in) x 5mm (0.2 in), the large backings measure 5mm (0.2 in) x 7mm (0.28 in). They are sold as a pair.