In the past few years, we have covered plenty of cool fidget spinners here. These Handcrafted Engine Fidget Spinners are also worth a look. The two-stroke and 4-stroke engines are made of stainless steel and brass.
The 4-stroke fidget spinner measures 75 x 50 x 50mm. It weighs only 75g. The other one measures 58 x 28 x 15mm. These are each a great conversation starter but can also help take relax you mind.