Rubber Baseballs (one dozen) by CarnivalSource.com! These rubber baseballs have lots of uses in carnival games. Use them to knock over milk or glass bottles, toss them into hula hoop targets or just play catch. These balls weigh 4.25oz. Size is 2 3/4" Diam. Find more great items like this in our Baseball Party Supplies category here at CarnivalSource.com. These rubber baseballs by CarnivalSource.com are perfect for carnival games, baseball parties, and more! Each ball weighs 4.25 oz and has a diameter of 2 3/4 inches, making it perfect for kids ages 3 and up. Get your dozen rubber baseballs quickly with same-day shipping from our Missouri warehouse. Our Baseball Party Supplies category offers more great items to complete your party. 1 Piece in Poly Bag/1 Dozen Brown BX.