12-Piece Density Metals Variety Set with Assorted Shapes Material_PVC Length-adjustable wooden pendulum simple-machine model

Length-adjustable wooden pendulum simple-machine model with a blue bob sliding along the string and a wooden guide keeping the swing on a consistent path for period-vs-length measurements

Dial-selectable multi-tap battery eliminator delivering 1

transmitting light end-to-end via total internal reflection to give a tabletop analogue of a fiber-optic cable

attached to a 10mm diameter 5

12-Piece Density Metals Variety Set with Assorted Shapes Material_PVC Length-adjustable wooden pendulum simple-machine modelAssorted shape density kit with 12 specimens across brass, iron, aluminum, copper, zinc, and lead, each 12 25g, giving students shape variation on top of the material density comparison.