KidWind Wind Turbine Hub, ten-pack of 12-hole crimping hubs, made from recycled plastic, allows you to turn any DC generator into a wind turbine, Diameter: 2.25 in, Maximum number of dowels: 12, Size of shaft hub press fits onto: 2 mm
Solar Cell with wires, 12.0V, 45mA, High efficiency small, can easily be connected together for larger load applications including higher voltage and current loads. Compact size with rugged, attractive casing. Perfect for charging 9V NiMH rechargeable batteries.
Drilled Ball Set, 1inch Diameter, set of 12, erfect for conducting own pendulum experiments, 3mm hole is drilled down the center of each ball, Comes in a plastic container with foam padding to hold the drilled balls firmly in place