To answer this question from the consumer's point of view, different consumers have different answers: Some people like hard and thick ones and feel that the manufacturer is real, there is no cutting corners, and the quality is good enough to be reused. Some people like thin and soft ones. They don’t feel comfortable when sticking them on their hands. They can be unloaded after a few days of playing. They don’t require the nails to be strong for half a month. From the manufacturer's perspective: thinness, toughness, and transparency are the standards to measure the technical level of the manufacturer.
