Dive into early physics with this two-piece submarine and floating raft, along with colorful weights, rings, balls and stars that bring investigations to life. Ten detailed Activity Cards with engaging, high-impact activities cover all aspects of STEM, plus key science concepts of buoyancy, density and more! Includes a comprehensive Activity Guide. Submarine measures 6 in L x 3½ in H. Size: 35.1 x 25.9 x 7.6 cm. Ages 5+.