Squeezable foam. The Golf Ball Stress Reliever can help you "swing" through even the toughest of days! Choose this polyurethane, squeezable foam stress ball for the next corporate golf outing that you organize. These relievers will vary in density, color, size and weight due to the molding process. Please be advised this product is not advised for children under 12. Add a message or logo to the product to really make a statement.