Expand your Tower & Pathways set with these slotted runs children can set up in simple or elaborate patterns, or use with your own unit blocks, to create paths for the 6 different-shaped spinners to travel down. Includes two 39 1/4", three 19 1/2", and three 13" MDF slotted runs and 6 wooden spinners. Ages 3 yrs. +. 14 pc. Set.