Premium Quality Set of Knobless CylindersDescription The Knobless Cylinders are the final stage in the dimensional material where the child, based upon his ability to discriminate, places the individual sets of cylinders in the correct order. Each set of 10 cylinders is contained in a separate beechwood box with the lid painted the same color as the cylinders. Specifications Brand Kinderhuis Montessori Minimum age 3 years Certification Montessori approved