Material:stainless stee,it is lead free and nickel free.Stainless Steel is hypo allergenic, it doesn??t rust, change colour or tarnish Measure: key ring: 3cm (1.18) diameter.round charm is 0.78 inch (2.0 cm),family tree is 0.66 inch* 0.70 inch (1.7cm*1.8 cm) Only The Best Moms Get Promoted To Grandma. This bracelet says it all and makes a perfect Gift For Grandma! A perfect gift for your mom or mother in law, let her know how much she means to you and your children/ or the baby on its way. The keychain will arrive in a pretty bag ready to be given as a perfect gift.It is a special keepsake made in memory of an angel baby for mommy and daddy.