This series has 8 styles, including 6 regular styles, 1 small hidden style, and 1 large hidden style. The probability of getting a regular style is about 16.2%, the probability of getting a small hidden style is about 1.39%, and the probability of getting a large hidden style is about 1.39%. That is, for every 72 pieces, there will be a small hidden style randomly replacing a regular style, and for every 72 pieces, there will be a large hidden style randomly replacing a regular style.