Plastic material: responsive ball is made of plastic, with no toxic element and unpleasant odor, people can play it without much pressure, because it is lightweight and portable Universal size: the size of responsive ball is about 5.5 x 5.5 x 2.8 cm/ 2.17 x 2.17 x 1.10 inches, which is a proper size for people to hold by one hand Plastic responsive ball: you will receive 4 pieces plastic responsive ball with string in random colors in a bag, sufficient quality for people to play and use; The rope can be arranged properly when responsive ball is not in use Entertaining gift: as an interesting tool, colorful responsive ball serves to be a good gift for your friends and families, they can have a lot of fun with it because of its challenging and interesting features Shining LED light: interesting responsive ball is designed with a LED light, which allows responsive ball to give out bright light while in spin; With this feature, responsive ball even can be played well in evening