Stackable Connecting Lead, Model X engine models the drilled aluminum ball gives

the drilled aluminum ball gives a lightweight contrast to steel and brass balls of the same size in pendulum period and momentum-transfer demonstrations

Twelve-inch black insulated 4mm-stackable lead with banana plugs at both ends

Greatly magnified Paramecium model reveals cilia arrangement

producing oxygen's characteristic emission lines for spectroscope viewing of atomic-emission and quantum-energy levels

Stackable Connecting Lead, Model X engine models the drilled aluminum ball givesUsed in high current circuits where exposed plug pins are not acceptable, this 4mm stackable safety lead carries up to 12A through nickel plated split hollow pins on both ends.