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 Acsergery Gift 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 .