POOF-SLINKY-All About Rocks Kit. Experiment with eight different rocks and crystals with the All About Rocks Kit. Right now rocks are being created and destroyed all around you and with this kit you can explore a rock's life cycle plus grow beautiful crystals and make a rock in your own kitchen. This kit contains eight rocks, one sand bag, one info card, one magnifying glass, and one instruction booklet. Recommended for ages 8 and up. WARNING: CHOKING HAZARD- Small Parts. Not for children under 3 years. Imported.