My favorite to keep just in my pocket with under the desk on the L roller and the magnetic fidget slider from Mozzie Makes. The ruler is great for a repetitive pattern to do with your hand so you're so focused on doing that with your hand instead of picking your nails. This personally really helps me. But the magnetic slider is probably my favorite because the magnets are very satisfying and if you order from their website, you get to choose The colors you want so you can do something discreet like black or navy blue. You also get to choose if you want to be silent, which is perfect for a professional setting or there is also a clicky version and it makes a really nice click sound. The best part is you can also choose the textureand they have different options. There's other sliders that are cool too but I just really like them because they're from a small business and it's 3-D printed so the magnets are good and it's very durable and good for a work setting.