A different "spin" on the usual fidget spinners! This one uses three 14mm ball bearings as spin weights, arranged round the bearing hub.. Be careful when putting them in, as they are quite tight.. It might need the spinner warming in some HOT water to slightly soften the plastic, and the central bearing hole may need a gentle scrape!! The centre bearing "mushrooms" need to be sized for the bearings.. 7mm or 8mm... Both are included as STL files..