Did you know that most pet charms on the market today contain lead (a heavy metal) and/or nickel (an allergic substance)? Our Unity pet charms base contains neither, making them a healthy and beautiful alternative, Because they are free of these harmful substances, they also make beautiful matching pendants or keychains for humans - adults and kids alike, Each unique piece of artwork is commissioned exclusively for Doggles Unity pet charms, Enamel face, real crystals, Rhodium plate, Lead Free, Nickel Free, Size: Smaller charms are 21 mm in diameter, Color: Dog Cat Yin and Yang Large, SKU: DGG015