Each book uses simple, repetitive text to teach basic vocabulary and gives readers an exciting tour through the properties of materials. Glass author: Cassie Mayer narrator: Tracey Steffora running time: 2:22 Metal author: Cassie Mayer narrator: Adrian Vigliano running time: 2:12 Plastic author: Cassie Mayer narrator: Tracey Steffora running time: 2:27 Rock author: Cassie Mayer narrator: Tracey Steffora running time: 2:11 Rubber author: Cassie Mayer narrator: Adrian Vigliano running time: 2:08 Soil author: Cassie Mayer narrator: Tracey Steffora running time: 2:30 Water author: Cassie Mayer narrator: Adrian Vigliano running time: 2:06 Wood author: Cassie Mayer narrator: Adrian Vigliano running time: 2:06 Comparing Materials author: Cassie Mayer narrator: Tracey Steffora running time: 7:09