ZENZII only uses the highest quality materials when it comes to its fashion jewelry. All base metal styles are made of brass or premium alloy and plated with white or yellow 18k gold. Resin and acetate styles are made of pure, undiluted material, and polished to perfection for a glossy finish. Also, we know the importance of providing quality styles that make your customers not only look good but feel good. And because of that, ZENZII styles are nickel and lead-free - meaning they are all hypoallergenic!