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It may be some strategic decision to stick to only red & black colors
But it probably was a huge mistake & I think they missed the boat on cashing in on new rubber colors in 2021

It may seem vain but you would not believe how many players would buy a rubber just for color with total disregard for its functionality

I never understood this
Because , they used to make rubbers in other colors before the 2 color rule of 1983