I've taught 1st grade for three years now, and when our curriculum called for our class to study shapes - the 4" Protractor Set is what our class has used from the start! (And we haven't had to replace any since then!!) Very durable and no issues whatsoever with them. Our class uses them mostly for circles, half circles and straight lines, but I can easily see them being used for high school and college-level course work without a problem.
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