Quality material: the baseball balloons is made of durable foil with automatic sealing (easy blowing and easy sealing), and can be inflated with helium or air without easy leakage. It can last for several weeks after being inflated Novel design: these baseball birthday party supplies include 6pcs 18 inch balloons , lovely baseball-shape design and classic white make balloons look close to a baseball, giving a realistic ball feel Easy to use: Baseball party decorations balloons are easily inflated and deflated, when the balloon is filled up to the right size,pinch the expansion mouth flat, the outlet port (air inlet) will automatically sealed; The tube is inserted into the balloon and then gently pressed by hand to release the gas Ideal party decor: Sports theme party decorations are ideal for setting up sports, birthdays, wedding, graduation, world game, baseball match, baseball games, or any other baseball theme parties and birthday parties Warm tips: Baseball party favors balloons can float after filling with helium, and can be fixed with rope or tape; please keep the mylar balloon away from sharp objects, fire sources, and do not over-inflate to avoid balloon bursting