["Features:\nbrand new and high quality\nFor instructions, please look at the picture. Please pay attention to the bottle, please use the beverage bottle.\nThe simplest is the bottle of drink, the size is completely suitable.\nDemonstrate a vortex in your classroom! Show that in order for water to flow down, air must flow up. These amazing connectors screw onto two plastic soda bottles and allow students and teachers to create a water vortex. Or, connect two small soda bottles and make a sand timer.\n\nColor: Random delivery (If you buy more than one,the color you received may be the same color or different colors)\nMaterial: Safe Eco- friendly ABS\nSales Way : Retail and Wholesale\nSize: One Size\nLength: 5cm (1.97in)\nWidth: 3.2cm (1.26in)\nHeight: 3.2cm (1.26in)\nQuantity: 1PC \n Note:\nIf you have big quantity , please feel free to contact me, I will give you best discount, thanks! \nSize For Manual Measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon.\nAnd due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includes: (Without retail package)\n1 x Bottle Connector"]