JUGS Bulldog Vision-Enhanced Yellow Poly Baseballs - bulk box of 100 These are hollow baseballs made for use with pitching machines, for close-range batting practice 1 oz. in weight for Baseballs These JUGS Polyballs last up to 30 percent longer than any other balls of its kind Uniform holes for maximum accuracy. Can be used in almost any pitching machine for close-range batting practice 100 Ball Pack. Color: Optic Game Day Yellow