Product description:
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