Consisting of four 18"(45 cm) long wooden blocks each with ten inset knobbed cylinders graded in height andor diameter. In block No.1 - the cylinder increases in both height and diameter. In block No.2 - Cylinder increases in diameter but remain constant in height. In block No.3 - Cylinder decreases in height but increases in diameter. In block No.4 - Cylinder increases in height while diameter remains constant. Additional Information: Pay Mode Terms: LC (Letter of
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