4-Piece Specific Gravity Cubes Set with Hooks Material_Muslin Sodium chloride lattice kit with

Sodium chloride lattice kit with 27 color-coded gray and green atoms plus 54 connectors for building the full cubic NaCl crystal structure in three dimensions

Hand-cranked 4-stroke gasoline engine model at 13

and three low-friction nylon wheels for straight-line momentum experiments

Built from two counter-rotating foil-sectored plates with a belt drive and a pair of Leyden-jar condensers

4-Piece Specific Gravity Cubes Set with Hooks Material_Muslin Sodium chloride lattice kit withFour cube specific gravity set in brass, iron, aluminum, and zinc, each 20mm on edge with a top hook for suspending in water during Archimedes principle and buoyancy experiments.