Eagle 11S First Base Training MittSize is 11" and as our Eagle 975 and Eagle 8 training models are perfect for the infielders, this first base trainer was made specifically for the first baseman. One of the most if not the most important fielder in the infield who can pick balls out of the dirt, save errant throws, put tags on runners, the work of a true first baseman to improve his skills should never stop. The Valle Eagle 11 first base trainer is just the mitt help him get to