... ,ASTM standards 3.Factory FSC,ICTI certified wooden ABC educational blocks for children(JM1080)material:birch wood+plywood.size:30*21 ... geometric figures:rectangle,square,triangle,cylinder,rectangular prism,and so on.apply those blocks to build more shapes.2.with parents' help ... , children can learn how to connection and extension blocks.3.with children's effort,they are able to make ...