KidWind Dowel, Recommended for College, High School, and Middle School Science, Diameter: 0.25 in, Length: 5 in, used for designing and testing wind turbine blades, and they fit into the KidWind Wind Turbine Hub, D100
Assorted Large Drilled Ball Set, set of 12, A 3mm hole is drilled through the center of each ball. Every set comes in a convenient plastic storage case, with a foam bottom that holds each ball firmly in place
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