The main difference between Promo Bears stress balls and other stress balls is that Promo Bears stress balls can be custom-made to meet any customer requirement. This means that Promo Bears stress balls can be made in any shape or color, from simple designs to complex customer logos and mascots. Other stress balls are often available in standard shapes and colors and cannot be customized. Promo Bears stress balls are also made of high-quality PU foam which is extra durable.