3 years and up. The possibilities of discovery are multiplied when rich variables are at children's fingertips. Random Robots: Loose Parts STEM Kit is a laboratory of opportunity to experiment and explore pieces and tools that children can use to create robots. Children can build, create, investigate, and invent while focusing on the process rather than the end product. The kit includes a frosted plastic tray for storage and classification of loose parts and measures 12.5"L x 12.5"W x 2.9"H.