This stress ball is made of PU material, with the Logo you need, it can relieve the pressure of office and study, and a squeeze may relieve excessive tension and anxiety. hey make a great giveaway at marketing and social activities and events. Available in a wide range of great assorted colors. Add your school, sports team, organizational or company logo or message through our color printed process. Orders of 5000 pieces or greater are eligible for sea shipping. 100% guarantee for quality.