• The Knobless Cylinders are the final stage in the dimensional material where the child places in order the sets of cylinders based upon his abilities to discriminate. The cylinders have interrelationships in size that are revealed to the child as he works with the sets in combination.
  • The Knobless Cylinders set consists of 4 boxes, each containing 10 cylinders. The four sets are each contained in a separate beechwood box with the lid painted the same colour as the cylinders.