Rock Tumbler - Pro Series

Professional-grade tumbling machine has rubber barrel to reduce noise, + shutoff timer to save electricity. Use of provided gemstones, or rocks from backyard. Kit contains jewelry fastenings, 4 different polishing grits, + tumbling instructions. Includes full-color adventure guide (written by teachers) with science facts and info. Activity booklet contains 10 puzzles and games for extra fun and learning.

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2015 Preferred Choice
Kids Educational Products