BUILDING FUN TUB – 300 PC/ 20 MODEL TUB SET – Introduce your children to endless building possibilities with the K’NEX Building Fun Tub! This building set from K’NEX comes with 300 different rod and connector pieces, which can be assembled into 3D configurations. Kids can follow instructions to create 20 different model ideas including: a Scooter, a Chopper, a Robot, an Excavator, and much more! Help your kids develop a better understanding of STEAM (science, technology, engineering, arts, and math subjects) with easy-to-follow instructions.