Anti-gravity demonstration model, Revolution, works on the principle of repelling magnets, ideal for discussing magnet levitation and frictional force experiments, Approximate product size: 2-1/2x 5 x3inch
Gears, sets offer 40-, 30- and 20-tooth gears with 3/16in bore to accommodate the most popular dowel size, and a 12-tooth gear with a push-fit to 2 mm motor shafts. Three inserts are provided on each sprue, allowing the 3/16in bore to reduce to 3 mm