Plastic material: the responsive ball is made of plastic, without any toxic elements or unpleasant odors, so people can play it without much pressure, as it is lightweight and portable. Universal size: the size of the 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 suitable size for people to hold in one hand. Plastic responsive ball: you will receive 4 pieces of plastic responsive ball with string in random colors in a bag, sufficient quantity for people to play and use; The rope can be neatly arranged when the responsive ball is not in use. Entertaining gift: as an interesting tool, the colorful responsive ball serves as a great gift for your friends and family, they can have a lot of fun with it due to its challenging and interesting features. Bright LED light: the interesting responsive ball is designed with an LED light, which allows the responsive ball to emit bright light while spinning; With this feature, the responsive ball can also be played well in the evening.