EFYTAL Additional Birth Month Charm ADD-ON ITEM ONLY: Note: This is an add-on item to another EFYTAL necklace you're purchasing at the same time. This charm cannot slide on/off the chain and you will likely not be able to put it onto your own necklace without some tools and know-how. PICKING THE CHARM: Pick your stones from the picture. Let us know which necklace it's going with. METAL OPTIONS: Sterling Silver or Gold Filled. Efy Tal Jewelry (manufacturer) stands by the quality of our metals. SIZE: THESE ARE SMALL - ranges from 2mm - 3mm. They are meant to be added to our mini charm necklaces.