Material:
high quality aluminum film. Note that this product is a cross-border high-quality aluminum balloon, which is not an ordinary plastic balloon sold by street vendors. All products are of export quality and all contain automatic sealing.
(Automatic sealing: easy to blow, easy to seal, can use balloons repeatedly)

specification: 18 inches, about 45cm

(The above dimensions are all measured manually, and there may be an error of about 1-3cm)