Grades 1 & up. Bring collaboration and STEM skills into your classroom like never before. Pieces snap, click, and pop together to form joints that rotate, limbs that extend, axles that spin, and lots more. Kids can create simple models in minutes, or get absorbed and spend hours at a time. There's no limit to what they can build: from animals to aliens, from dinosaurs to DNA. Set includes: 175 pieces, string, wheels, a ball, rubber bands, a foam play pad, and 25 increasingly difficult challenges based on STEM skills.