Material: These big balloons are made of 100% natural latex material, thick and non-porous, very durable and reusable. The surface of the balloons looks a little dusty, it's actually to prevent the balloons from sticking together, add a little talcum powder, you can wipe them and they will be shiny again. Size: The giant assorted colored balloons are about 18 inches in size after inflating, they can be filled with air or helium, helium can make the balloons float. Wide Application: These big round balloons are suitable for parties, festivals and events, such as birthday/wedding party decorations, Valentine's Day, Easter, Mother's Day, Father's Day, Independence Day, baby showers, bridal gifts, Thanksgiving decorations, Halloween, Christmas decorations, etc., providing excellent decoration. Quality Assurance: We guarantee a return and refund within 30 days if you are not satisfied, and we will replace the entire bag if you find a hole. If you are not satisfied for any reason, please contact us and we will send you a replacement or a full refund. Size: The giant assorted colored balloons are about 18 inches in size after inflating, they can be filled with air or helium, helium can make the balloons float.