I made these individual charms from porcelain clay that is durable and smooth to the touch. Unlike air-dry clay, porcelain is the most refined clay that will last for a long time, and is waterproof. These are fired at hot temperatures twice in a kiln that makes this craft a skilled, time-consuming process. Bought individually, your charm(s) will come with a thin, black velvet ribbon to tie as a choker necklace. You can also make your own custom charm necklace that comes with a gold bar necklace (18" in length). For a custom necklace, message me about which charms you'd like for a price quote. Sizes: Each charm varies in size, but they are all approximately 3/4" to 1" in length and 3/4" to 1" in diameter and are considerably 'dainty' in comparison to chunky-style statement pendants (with the exception of the starfish pendants, which are larger). For exact dimensions of a particular charm, message me!