Most popular product on Amazon.com : Markwort Synthetic 9-Inch Cover Weighted Baseball,Synthetic cover, yellow stitching. As you train, gradually increase the weight of the ball as you build strength in your throwing arm. Color coded cover indicates the ball weight. Weighted baseballs are 9? circumference with varying weights. (Size of regulation baseballs are 9? and 5 oz.)
Product Description : Synthetic leather cover Cork core center with wool yarn winding Good product as advertised. Only as good as the effort you put into using them. Won't make you a great pitcher, but a good training tool.
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