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Summary This fidget spinner requires a 22mm diameter bearing in the centre, and 3 pennies in each of the outer holes. *The centre bearing my need a dab of superglue, depending on your printer settings. To make it spin faster, use carburetor cleaner to degrease the bearings. The bearings I used: https://www.amazon.ca/Bones-Bearings-Mini-Logo-Skateboards-Silver/dp/B00D445P1S/ref=sr_1_3?ie=UTF8&qid=1490482707&sr=8-3&keywords=bearings