Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets Virtually friction-free 2-meter air track

Virtually friction-free 2-meter air track shipped with vehicles

Hinged V-section arms grip lenses and mirrors up to 75mm in diameter

Five-piece giant wooden clothespin set sized at 7

sized for energy-storage demonstrations where stored joules need to discharge through a visible load

demonstrating mechanical advantage as the angle of incline changes the effort needed to roll the cart up the slope

Wooden Frame Abacus, 6 Steel Wires Chemistry_Molecular Model Sets Virtually friction-free 2-meter air trackWooden frame abacus on a 13. 5 by 9. 5 inch finished base, six steel wires carrying 20 beads each for hands on instruction in counting, place value, and basic arithmetic.