These are 10K white gold earring posts. Stamped with "K10". You can easily create original earrings by attaching parts with accessory glue or similar. Perfect for making handmade earrings! Approximate size: Thickness: 0.65mm, Total Length: 10.8mm, Direct-connect plate: 2mm They are slightly smaller and thinner. The last image shows an example using 8mm pearls. The post in the image is platinum, but the size is the same as this product, so please use it as a size reference. K10WG 10K White Gold Earring Post, 1 set