... quality and environment-protective green products. Metal Fraction Circles with StandsMathematics categoryHelps the child to understand the fundamental of ... productsKey words: School equipment, Educational toy, Montessori equipmentMeets international standard with ASTM and CE certificatesNotes: this is an educational product and ... Supplier Certificate: CE, ISO14000, ISO9001,FSC,ICTI,BSCI,ASTM,CHPA