Looking for an inexpensive pyramid to do experiments with? Well, this is it! These fold-up cardboard pyramids are made from heavy-duty 275 lb test cardboard, precision cut to the same 51.83 or 72 degree slope angles as my other Giza and Nubian pyramids and held together with super-strong Gaffer's tape, a high-quality duct tape made out of cloth. Designed to be firm and steady when placed on a flat surface, but folds up easily and quickly when not in use, and has no metal in it whatsoever. Use it for all sorts of experiments from energizing water to sharpening razor blades.  Most of the well-known pyramidologists, including Patrick Flanagan, Max Toth, Antoine Bovis, and Karel Drbal all started with cardboard pyramids and achieved impressive results.  And if you can get over the goof-factor, meditating with one on your head can be an amazing experience! (See pictures below.)