You can squeeze or slide the marble forth and back, bend it, fold it, squeeze the sleeve together and roll the marble like shaking bell. Break old bad habits by keeping your fingers busy to stop nail picking and biting, and prevent new ones from forming. Fidget toys will take anxiety way and help the person enter into a calmer state of body and mind, promote active listening, soothe fidgeting. This type of movement activity gets the brain working, keeping your hands engaged in something that will soothe you and relieve your anxiety. Made of durable high quality density nylon and marble. Proprietary stitching method to ensure marble doesn't pop out. At a length of 3.5" these can be manipulated with ease by hands of both children and adults Machine washable; air dry.