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.