4-Cell D-Size Battery Holder Capacity_10mL 5-inch needle-pointed stand grips a

5-inch needle-pointed stand grips a 3/4-inch-wide bar magnet upright for hands-free study of attraction

Chrome-plated steel wire stand at 5 x 5 x 5 inches supports flasks and beakers above alcohol burners for classroom chemistry demonstrations

resistor networks

Shows oxygenated and deoxygenated blood paths between heart chambers and alveolar surfaces through seven hand-painted removable parts designed with medical-professional input

4-Cell D-Size Battery Holder Capacity_10mL 5-inch needle-pointed stand grips aFour cell D size holder in unbreakable plastic with curved retention sides, sized to deliver 6V at the high current capacity of D cells for sustained electromagnet and motor demonstrations.