Made Of Plastic And Silicone. Adheres To Back Of Your Phone With Strong Adhesive. Perfect For Carrying Identification, Room Key, Cash Or Credit Card. Fun Stress Reliever. Press Bubbles Down To Relieve Stress. Make Your Own Pattern By Pressing On Different Bubbles Or Just Press For Fun. Provides Tactile Stimulation. Encourages Focus And Provides A Soothing Sensory Experience. Provides A Calming, Self-Soothing Sensory Outlet. Perfect For Reducing Stress And Boredom.