Enhance your child's creativity and problem-solving skills with this K'NEX Set. The set includes a green hard carrying case with 141 interlocking pieces made of plastic. The pieces come in an assortment of colors and designs, perfect for creating different models and structures. With 141 pieces, your child can create their own unique structures and designs.  This building toy set is perfect for kids who love to build and create, providing hours of entertainment and stimulation.