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This unique kit has everything you need to introduce your students to the challenging concept of density. Using scientific experimentation and observation, you can demonstrate that different objects with the same volume may have different densities. Kit includes two cube cylinders with flexible inserts, two cylinders with flexible inserts, 2 solid cubes (81g and 227g), plus 10 ping-pong balls and cotton balls for additional demonstration and an Activity Guide full of ideas. The versatile, plastic containers can also be used to hold other common materials such as sand, water, popped popcorn or rice