Thermal Expansion And Cold Contraction: Due to the thermal expansion and contraction of the gas, the aluminum film balloon should be properly inflated in winter or when the temperature drops; in summer or when the temperature rises, the aluminum film balloon should be properly deflated to avoid bursting. How To Inflate Aluminum Film Balloon: Step 1: Find the sealing position and insert the hand pump (or straw). Step 2: Slowly inflate and pre-fill 90% to avoid explosion. Step 3: Pull out the hand pump (straw), the balloon is automatically sealed. Balloon With Base: Can be used repeatedly, can be filled with nitrogen, etc. Tips: When inflating the aluminum film balloon, it must be slow. You can use a pump to inflate it to 90%, and then blow it with a straw to control the air volume and avoid bursting. If there are 2 layers of aluminum film sticking, be sure to stop inflation, gently pull the 2 layers of aluminum film by hand and then inflate, otherwise it will be easily damaged. Name: Halloween Aluminum Film Balloon Material: aluminum film/aluminum foil Style: Pumpkin/Witch/Dead Tree Process: printing Size: Pumpkin: about 62x111cm/24.40x43.70inch Suitable for: Halloween party, courtyard, bedroom living room, shopping malls, hotels, parks and other decorations Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you Please allow 1-2cm measuring deviation due to manual measurement. Package includes: 1 x Halloween Aluminum Film Balloon