2.0 What is the tension of the flat rubber band?

Classic 2.0*4.0mm flat rubber band, single tension: 2kg. Common rubber band models have four digits, such as: 2040, 1842, 1745, 2550, etc. The first two digits represent the diameter of the inner hole of the rubber band. The last two digits represent the outer diameter of the rubber band. For example, 2040 refers to a rubber band with an inner hole of 2MM and an outer diameter of 4MM. 2550: refers to a rubber band with an inner hole of 2.5MM and an outer diameter of 5 mm. A solid rubber band is not suitable for a slingshot rubber band, and its rebound is not ideal because of stress. The thinner the rubber band, the better the resilience and the worse the bearing capacity. The thicker the rubber band, the worse the resilience and the higher the bearing capacity. In layman's terms, the thin rubber band of marbles will play higher and farther. Through practice and summary, the following best combination is obtained.