Attribute Games and Problems, unit was developed as part of the ESS unit to apply certain classification concepts: observation, identification, combinations, ordering and analyzing
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