PU Foam Stress Ball is Made of High-quality Polyurethane Foam, Offering a Soft, Lightweight, & Durable Design with a Smooth Surface & Comfortable Grip. Featuring a Slow-rising Texture, It Provides a Satisfying Squeeze Experience That Helps Reduce Stress, Ease Tension, & Improve Focus. Safe for Everyday Use, It Quickly Returns to Its Original Shape After Compression & Resists Cracking During Repeated Squeezing. Ideal for Offices, Classrooms, Homes, Travel, & Relaxation Breaks, It Also Helps Strengthen Hand Muscles & Improve Finger Flexibility.