All the balloons are double-sided. You just need to pinch the opening of the balloons after inflating the viscose will seal automatically. Made of aluminum mylar foil material durable and reusable. Specifications: Material: Aluminum Design: Retro Theme Elements Color: Rainbow Pink Gold Quantity: 16PCS You will receive: 1 LETS ROLL Balloons banner 2 Roller Skate Balloons 2 Radios Balloons 2 Disco Ball Balloons 2 Star Balloons 1 Roll of Ribbon 1 Straw Mouth Weight: 130gram Package Size: 22cm�18cm�2cm/8.7 �7.1 �0.8 CAN BE USED FOR ? Roller Skating Parties ? Birthday Decorations ? Event Decor ? Photo Props ? Celebration Accessories ? Sports-Themed D�cor ? Party Favors ? Outdoor Parties ? Competition Props ? Shop Displays OCCASION Birthday Parties Graduation Celebrations Baby Showers Anniversary Parties Outdoor Picnics Corporate Events School Dances Carnivals or Fairs Holiday Gatherings ?WARM TIPS Please allow slight size error due to manual measurement. Ribbon included in the sale. Straw for easy inflation by mouth is included in the sale. Balloons come together in a clear film pack have creases once inflated they disappear. Over-inflating the balloon will distort its shape and cause it to pop.