My earrings are made with medical grade, commercially pure titanium. Titanium is the safest metal for piercings because it is inert and non-reactive with the body. It is commonly used in medical implants.
I highly recommend purchasing the starter earrings if you have very sensitive ears or piercings that are not fully healed. They can be worn for a few weeks until the piercings are properly healed, then other allergy free earrings can be worn comfortably.