This series has 10 models, including 8 regular models, 1 surprise model, and 1 secret model.
The probability of getting a regular model is about 12.11%,the probability of getting a surprise model is about 1.04%, and the probability of getting a secret model is about 1.04%.
That is, in every 96, there will be 1 surprise models randomly replacing 1 regular models, and in every 96, there will be l secret model randomly replacing 1 regular model.
