Learn about sea levels and scientific forces! Dive into ocean exploration with these calming sensory bottles that provides a fun and tactile way for children to focus their attention and calm down. The Sink and Float bottle is designed to explore buoyancy and is filled with oceanic items that sink or float depending on their weight. The Fast and Slow bottle is filled with two liquids that represent two sea levels with different densities and includes sea animals that move freely at different rates! These Sensory Bottles are perfect for calm, quiet focus and for on-the-go fun! This set includes 2 easy-to-grip, securely sealed bottles that are sized for little hands. For over 50 years, hand2mind has encouraged hands-on learning and discovery, driving deeper understanding and helping children unlock their full potential. hand2mind is a pioneer in social emotional learning products that help kids build mindfulness as well as how to deal with their own emotions. From kindergarten to middle school, hand2mind has you covered with products designed to enhance learning in the classroom and the world around us. Through hands-on exploration and discovery, we strive to find new ways to encourage students in math practice, literacy activities, STEM education, Social Emotional Learning and more!