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TIPS：

1. Common balloons are divided into two types: ordinary balloons and pearl-lustre balloons. Pearl-lustre balloons are covered with a layer of pearl-lustre powder.

2. Regular balloons are more vivid in color than pearl-effect balloons, but under light or sunlight, the reflectivity of pearl-effect balloons is stronger, making them appear brighter.

3. The specification and size of a balloon are named based on the diameter of the balloon after it is inflated. For example, a 5-inch balloon (or 5-inch ball) refers to a balloon with a diameter of 5 inches after it is inflated. One inch is approximately equal to 2.54 centimeters, and a balloon with a diameter of 12 centimeters after it is inflated is a 4-inch balloon. A 10-inch balloon has a diameter of approximately 25 centimeters.

4. Balloon specifications can also be indicated by weight, with a 6-inch balloon equivalent to a 10-inch balloon, and an 8-inch balloon equivalent to a 12-inch balloon.

5. In balloon decoration, we often use balloons in sizes of 5 inches, 10 inches, 12 inches, and 18 inches, while other sizes are used relatively less often, often as accents.