SplatRBall Certified 7.5mm Ammo. The original orange SplatRBall ammunition optimized for use in battery powered SplatRBall Blasters. With up to 20,000 rounds in each bottle, this non-toxic ammo allows you to get the most out of your SplatRBall Blaster and enjoy hours of fun with your friends. 7.5 mm water ball ammo. Non-Toxic 20,000 ct Easy Loading. We recommend using Certified SplatRBall ammunition on your SplatRBall blaster.