Features: - Made of non-toxic thermoplastic rubber (TPR) with small crystal jelly beads inside. - Durable and can withstand thousands of squeezes. - Reduces stress and forearm, relieves wrist pain for office workers. - Easy to clean: if dust sticks to the ball, rinse it with water and it will be instantly clean. Specification: - Material: Thermoplastic rubber (TPR) - Colors: Multicolored - Package: pack of 4 - Suitable for: Any occasion and all people. Package list: - 4 pcs * stress relief balls Note: - Due to manual measurement, allow small size errors. - Due to the difference in light and screen, understand that the item's color may be slightly different from the images