Men's fastpitch in the USA still uses a white ball today. The Worth Kmaster. Internationally, it's the same ball as women, Mizuno..... which last i knew you couldn't even buy in the USA. Personally, I loved the Mizuno ball. Lightweight with good seams. It is optic yellow though. Worth makes the white ball 1 day a year, and in that 1 day they make enough for all of North American men's fastptich. I believe their contract is up in the next year or 2, it'll be interesting if they continue it. The same ball is available in Yellow, so it may not be worth changing things over for a single day a year. The men's teams will scream and cry about using the yellow ball but its simple economics for Worth.