Product Information Material: Plastic Size:6.5cm It is very suitable for use as a stress relief and sensory stress toy for children and adults. This luminous ball has long rubber nails that stimulate hands and help challenge the senses. They are very effective and you can use them as a treatment ball to help people with autism or anxiety problems calm down and relax. The LED light pendulum pointed ball has bright lights, which is very suitable for all kinds of night games; soft nails can also be used to massage the palms of the hands, which is good for relieving stress and is suitable for the elderly or people with weak hand strength and finger flexibility. It can also be used for massage, foot massage, yoga, relief, and sensory stress therapy. Package included: 24PCS Balls Note Please allow 2-3 cm difference due to manual measurement. Besides different computers display colors differently, the color of the actual item may vary slightly from the below images, thanks for your understanding(1 inch = 2.54 cm)