Mizuno 313207 GPS-30 Pro Select Premium First Base Mitt Baseball Glove 12.50" - CamelMizono GPS 30 Pro Select Premium First Base Mitt Baseball Glove 12. 50" Elevate your game with the Mizuno Pro Select, premium Steerhide baseball glove. This glove exemplifies high level craftsmanship from quality materials that athletes have come to expect from Mizuno. Designed with a perfect balance of durability and comfort, this glove features premium Steerhide leather that boasts a quicker break in time without compromising structural integrity.