Set includes two helical springs. The long, narrow spring measures 3/4" x 72" and can be extended to 5 meters. The larger spring measures 3" x 4", and can be extended many times its length without distortion. Includes activity guide. Additional Info: Set includes two helical springs. The long, narrow spring measures 3/4" x 72" and can be extended to 5 meters. The larger spring measures 3" x 4", and can be extended many times its length without distortion. Includes activity guide. Package Size(L x W x H): 9.5 X 6 X 3.75 (IN) Categories: Waves, Springs HTS Code: 7320.20.5060 UNSPSC: 6.01048e+007 Country Of Origin: INDIA