SKLZ Weighted Baseballs 2-Pack (Yellow 10 oz, Black 12 oz) Includes 10 ounce and 12 ounce weighted baseballs; same size and construction as an official baseball Ideal for building throwing and pitching strength Great for pre-game warm ups Arm strength training with a partner or a SKLZ Pitchback Net Constructed in different colors to tell apart from regulation baseballs