Check the listing for details. XL Brushed Copper Earring Bases. Color: Aged Copper, Condition: New. Listed at 2.45 USD. The XL Brushed Copper Earring Bases are 2.75" long and come in a set of 2. Made of aged copper, these earring bases provide a sturdy and stylish foundation for your jewelry making projects. Crafters and jewelry enthusiasts can use these materials to create unique and elegant earrings with a touch of sophistication. Perfect for those looking to add a touch of copper to their designs, these earring bases are versatile and easy to work with.