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

attached to a 10mm diameter 5

rocker arms

and engraved index line for reference alignment

Built to reveal stress fringes in transparent solids

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.