Real Coal Specimen Set with Cotton Bag, 5-Piece Lab Supplies_Sieves Longitudinal head-throat-lung cross section reveals

Longitudinal head-throat-lung cross section reveals the full air pathway from nostrils through trachea to alveoli at half life size for respiratory teaching

5V to demonstrate the wet-cell ancestor of the modern dry battery in early electrochemistry units

using wide-pad threaded metal screws for secure fastening

the slim half-disc geometry letting beams enter the curved face along its radius for clean refraction-angle and TIR observations

Real Coal Specimen Set with Cotton Bag, 5-Piece Lab Supplies_Sieves Longitudinal head-throat-lung cross section revealsBundled in a cotton drawstring bag with a linked crystal growing activity, this pack of five small lumps of genuine American anthracite coal doubles as novelty and classroom specimen.