Balloon Sizer Cube:12 inch/30.1cm, with size marked on the surface 9 Different Hole Sizes: 10 inch(25 cm), 9 inch(23 cm), 8 inch(20 cm), 7 inch(18 cm), 6 inch(15 cm), 5 inch(13 cm), 4 inch(10 cm), 3 inch(8 cm), 2 inch(5 cm) Material: The balloon sizer box is made of plastic, easy to assemble and use, but is a little soft, make sure the product can implement it's function Ballon Size Measurement Box: Collapsible and durable. The box support to be washed and is perfect for making balloons to birthday parties, wedding, baby shower and any other celebration Usage: Balloon size measurement tool for party balloon decoration, consistent size balloons make balloon arch and columns look professional and beautiful