Handcrafted Model Ships - Brass/Copper Diving Helmet Key Chain 5&quot; Brass Key Chains Marine Key Chains - New - This nautical-themed key chain is both adorable and functional, featuring a brass and copper diving helmet key fob. Crafted from solid brass and copper, this key chain is as beautiful as it is durable and functional. A knurled knob allows you to easily and securely add or remove keys from the ring. These wonderful key chains make ideal gifts for friends, family, employees, clients, co-workers and especially yourself.