specification:The base size:12.5*13cmBlue: excircle diameter: 12.5 cm Inner circle diameter??5.5 cmGreen: excircle diameter: 11.5 cm Inner circle diameter??5 cmYellow: excircle diameter: 10.5 cm Inner circle diameter??4.5 cmOrange: excircle diameter: 9 cm Inner circle diameter??3.5 cmRed?? excircle diameter: 9 cm Inner circle diameter??3.5 cmPackage size:24*12*12 cm1.Exercise the child a sense of spatial cognition2.Exercise children color cognitive ability3. Exercise the child hand brain coordination ability and focus