Edutiles Foam Playmats Uppercase Alphabet 26 Pieces - Complete Alphabet Set Learning Skills: Fine Motor SkillsColor and Letter RecognitionSpelling 26 Tiles with removeable Uppercase AlphabetDimensions: Each tile is 12 x 12 inch and 1/2 inch thick.Materials: PE foam (Polyethylene) which is a a type of EVA foam. CPSIA CompliantConforms to ASTM F963-96aMade of PE foam (Polyethylene) which is a a type of EVA foam. PE is safe for all ages and nontoxic. These mats are also 13 mil. thick and are safety compliant for infants and toddlers who might fall and bump their heads.