Wilson A1000 1620 Model 12.5" Baseball First Base MittAnchor the infield with the A1000 1620, a 12. 5 first base mitt made with full grain leather that breaks in fast and forms to your hand over time. The 12. 5 reach, single break point design and Reinforced Single Post Web create a deep pocket to help young first basemen pick any throw. Handcrafted in the Wilson Pro Stock Factory, the A1000 1620 is designed with young players in mind, offering the combo of agility and toughness needed to play first.