Knobed Cylinder Block Set

We are offering knobed cylinder block set. 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.