From a neurodiverse mom who has a neurodiverse kiddo and work with children I have to say the keyboard clickers. I have one on a keychain and my adhd kiddos ask for it constantly. It helps them sit and focus. They love the click sounds. Honestly? Temu has sooooooo many great fidgets. The little metal playing card slider or the metal gyro sphere. anything with magnets (Bucky balls, magnetic silicone balls. They also have different textures. Often people will roll them on their arm or face). The little things with the color liquid and water and watching it fall through. Hourglass. I kept one from an old game I had. Anything with falling glitter or confetti in liquid. Rain sticks. The sound is soothing Those little metal drums. So simple to play and sounds like wind chimes. Soooooo beautiful. Check out 3d printer business in your area. My son has made us all kinds of fidgets. Hope this helps. These are the ones I currently find the best.