1.25" long copper skeleton keys are used for these earrings.  The top section of the key is a circular cloverleaf pattern.  The earrings use matching rose gold fishhook earwires and are 1.25" long.  
 
All metal used is hypoallergenic, nickel-free, and is sterling silver, silver or gold-plated, or stainless steel unless noted otherwise. Every item is handcrafted, custom-made, nothing mass-produced.