Plastic Material: This responsive ball is made of plastic, free from toxic elements and unpleasant odors. It's lightweight and portable, allowing for easy play without excessive pressure. Universal Size: The responsive ball measures approximately 5.5 x 5.5 x 2.8 cm/2.17 x 2.17 x 1.10 inches, a comfortable size for one-handed use. Responsive Plastic Ball Set: You'll receive 4 Acsergery gift responsive plastic balls with strings in random colors, providing ample supply for play and enjoyment. The string allows for neat storage when not in use. Fun Gift: This colorful responsive ball makes a great gift for friends and family. Its challenging and engaging features provide hours of fun. Bright LED Light: The responsive ball features an integrated LED light, emitting a bright glow while spinning. This feature enhances playability, even in low-light conditions.