This necklace features an 18" with a 4” extender for an adjustable length up to 22”, 18k gold plated tarnish-proof brass chain, a raw brass charm featuring the moon phases and a tarnish-proof brass wire wrapped, ethically sourced, fossilized Sand Tiger Shark tooth charm with a gold plated lobster clasp closure. If you need a chain longer than what is listed, please leave comment on your order and I’d be happy to accommodate.All orders are shipped in compostable, eco-friendly materials. 10% of profits from this item will be donated to the Thresher Shark Project: Indonesia. This project seeks to protect the keystone species of Thresher Sharks, while also aiding the commmunities currently dependent on shark fisheries for survival with more sustainable means of income.