NSK claims to have developed a fidget spinner that whirls longer than any on the market — 12 minutes and counting. Most fidget spinners, the must-have toy for 2017, can only spin on their own for a few minutes at most. But a subsidiary of precision machinery maker NSK has applied ball bearings used in space satellites and computer disks to make the Rolls Royce of fidget spinners. The propeller-like gadget has ball bearings in each of the three “blades” that keep the propeller spinning effortlessly around the central bearing with the flick of a finger. “We're confident that ours is the longest spinner around,” said Toshikazu Ishii, president of NSK Micro Precision Co.