Quadrilla An educational toy that allows for endless assembly with wooden parts. - Brand: Quadrilla - Model Name: Twist & Rail Set - Target Age: 4 years old and up - Material: Wood This is an older item, but it's still in usable condition. However, two parts are missing, and the marbles have been lost in other play. See photo 13. It has been used for a long time, so there is some color transfer from the colored parts to the wooden parts. The outer box has also been reinforced with tape, so please check the photos for confirmation.