Features: Brand new and high quality. Each foil balloon has a tail. You can inflate it from there. The balloons have self sealing valves. Once inflated the balloon will stay up for over a week. The balloons can be filled with helium to float or filled with air to attach to any surface, the balloon will come flat and need inflating after you receive it.The balloon sold without helium. Specification: Material:foil. Size before inflate: 40cm-16inch. Color:Pink,Blue,Gold,Silver,Colorful. After inflated size about 35*22cm-13.8*8.7inch. 13pcs/lot: HAPPY BIRTHDAY. Note: Due to lighting effects, monitor's brightness , contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item. Please allow 1-2mm differs due to manual measurement, thanks. Package Included: One Set Happy Birthday Foil Balloons(13pcs) NO Retail Box. Packed Safely in Bubble Bag.