The MAXIMA MC Square is a lead safe stone with an amazing brilliance, with precise sizing and shape and durable coatings and foiling. Using a special technology, these stones have less than 90ppm of Lead and Barium. They are compliant with the following world standards: ASTM F2923-11, ASTM F963-11, CPSC 16 CFR 1303, CPSIA, Directive 209/48EU, OEKO-TEX Standard 100 and more.