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Grade 4. Many items in the Unit 4.1 Energy Transfer: Collisions 1-Class Unit Kit, Carolina Certified Version (item #523551), may be reused. This 1-Class Refurbishment Set, compatible with the Carolina Certified Version* of the unit, replenishes kit items that cannot be reused or were consumed during instruction.

*All enhancements to materials and instruction for this Carolina Certified Version of the unit are approved by OpenSciEd® to preserve the integrity of the storyline and the instructional model.