Lost the butterfly backs for your favourite earrings? Don't throw them away - you can get your hands on a new pair of backs easily. These ones are made from 9ct yellow gold and are designed to hold larger earrings in place. They measure 0.4 x 0.3 x 0.3cm and weigh just 0.06 grams. If your earrings are small studs then check out our smaller butterfly backs.