Round stress ball diameter:2 1/2" is made of polyurethane foam. It is perfect for trade shows, expos, conferences, and community events. Different colors and shapes are available.This round stress reliever ball offers the ergonomic squish you're looking for, all with a colorful promotional touch.A wrap-around imprint in your choice of colors means you can get your brand directly into the hands of those that matter most, whether it's employees, clients, customers and more!