Produced since 1921, these Japanese gyroscopes must be the best 'toy' gyroscopes on the market. Superb all metal construction. The outside diameter is two and a half inches (63mm) and weighs approximately 80 grams (100 grams including box). Includes starting string, pedestal, and operating and maintenance instructions (in English). Comes in a plastic box to store it in. An adult using the provided string can spin it up to 8000rpm.
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