PicassoTiles 136pc tube lock set (SKU: PTT136) offers infinite architectural possibilities to young children who are just learning how to build with their own hands at early stages, allowing them the opportunity to stimulate the imagination and learning skills while encouraging discovery, developing motor skills with open-ended play. Frustration-free, kid-friendly pieces are designed to be easy for children at age 3 and older to easily connect together and take part.