Polyurethane foam;Classic promotional giveaway ideal for sport-theme events, school and team spirit giveaways; Our hand-crafted polyurethane foam stress balls are a fun way to promote your company, organization, hospital or school, while also helping everyone who receives one squeeze away the stress of everyday life!; NOTE: Due to their hand-crafted nature, stress ball sizes, colors and textures may vary; Factory cannot guarantee consistent imprints or PMS matches; Not intended as a child's or pet's toy; White may discolor over time; Product Size: 2.5" dia.;