A collection of hands-on experiments and activities using rocks and minerals

Connect the pump and machine to a 12-volt DC battery or power supply

This mat is flying off the shelf like Frisbee's

and remarkably durable

ISBN: 9780738598758

6Pc Precious Metals & Ring Marking Stamp Set with Stand & Hammer - 10k, 14k, 18k, SS, Platinum, Sterling F22 A collection of hands-on experimentsIncludes Stand and Hammer 6 Metal Ring Markers: 10k, 14k, 18k, SS, Platinum, Sterling. Material of Punches: EN31 Carbon Steel Includes Lightweight Dual Headed Nylon Hammer Used for Marking Non Ferrous or Precious Metals Bent Stamp for Marking Inside Ring Shank Instructions: Position the stamp on the item and strike with the included hammer.