This great rock tumbling kit comes with everything you need to polish stones and gems. Tumbling is easy: just place a few rocks or minerals into the tumbler with some grinding powder, and start tumbling! The grinding powder duplicates the erosion process that takes thousands of years in nature. It also comes with jewelry-making accessories to display the rocks, and is excellent as a birthday present or Christmas gift.
This genuine meteorite is great for the rock collector in your family!
Build a model car that runs on hydrogen gas using a unique reversible fuel cell!
This great rock tumbling kit comes with everything you need to polish stones and gems!
Build 20 different solar powered models with unique building pieces, controlled by an RC handset!
An unconventional ball-tossing, head-catching challenge for 2 players or teams!
Get one of the craziest and coolest kaleidoscopes around!