Rubberwood (hardwood) block D (Picture shows all 4 blocks) has 10 cylinders to aid children in visual discrimination of size. Grasping of the knobbed cylinders indirectly prepares children for holding a pencil. Lightly lacquered with easy grasp, sturdy knobs. Regularly $47.00 each.
Picture shows all 4 blocks. Block D, S3001 item only is Decreasing height, Increasing Diameter.