Easy to use: Pull off the label to activate the LED light ball then just blow up like any other balloon. You can fill the balloon with common air or helium. (The balloon will float in the air with helium.) Safe Balloons Size to to you and Child: Before inflating, the balloons is 12.5cm/4.9 inch; after inflating, the balloon can be 30cm/12inch to the largest. These LED balloons are made with premium quality latex that is safe to be use around kids.After all, your safety is our concern. Suit For Any Festival Party Decoration: The light up balloons set can be great decorations in your dream wedding, birthday party anniversary themed party, Valentine's Day, etc.bring much pleasure to your family and friends. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!