Material:stainless steel,it is lead free and nickel free.Stainless Steel is hypo allergenic,it doesn??t rust,change colour or tarnish.Size:the ??autism mom?? charm measures 2cm(0.79inch) in diameter,the puzzle piece charm is 1.2*1.2cm(0.47inchi),and the adjustable bracelet is 6cm (2.37inch) in diameter,fitting most people??s wrists.The autism charm bracelet is hand stamped with ??autism mom??,comes with a puzzle piece,helping raising awareness for Autism.The autism bracelet holds a special meaning,wear it proudly to support your children who diagnosed with autism and tell others you are his /her biggest advocate.The bracelet will packaged in a velvet bag as a perfect gift for yourself,for any mom with an autistic child, someone who loves an autistic child, or anyone working with autistic individuals.