This Baden all-weather practice baseball is built with Coreguard which protects the ball from getting water logged. If exposed to wet condition, this ball dries back to original weight and condition within 24 hours. * CoreGuardT protects the ball from getting water logged. Dries back to original weight and condition in 24 hours. No need to replace balls ruined by wet conditions. Allows you to continue to play through damp conditions. Official size and weight. Available in pack of dozen