Extra inserts for use with the 13 inch North Star Universal Insert Bat. This system saves a great amount of shelf space when making pieces with a small "footprint". The inserts are 1/4 inch thick which fit flush with the top of the outer bat. The inserts are 5.5 x 5.5 inches. Inserts remove easily yet fit snugly enough that the cavity stays free of clay and slurry.