The best choice for decorating your party the kids must be love it! Notice:Although helium can be used the item will not float like other foil balloons with helium in. Specifications Material : Aluminum Foil Size: about 18x25inch Package Contents 1x Zebra Balloon 1x Giraffe Head Balloon 1x Dairy Cow Head Balloon 1x Lion Head Balloon 1x Tiger Head Balloon 1x Monkey Head Balloon Warm tips: 1.Please inflate the balloons gently in case of burst. 2.Sharp objects dirty floors direct sunlight and excessive extrusion will cause to damage or burst. 3.Please frequently inflate the balloons in winter or cold days deflate them in summer or hot days. 4.Please inflate these balloons the same day you need to use them one time inflating of hydrogen or hellium usually keeps balloons floating about 6-14 hours.