PORCELAIN BURNISHING MEDIA: Cylinders (shown below) and Microbrite Spheres in Conditioned and Unconditioned; available in 2 mm (1/16), 3 mm (1/8), 4 mm (5/32), 6 mm (1/4), and 9 mm (3/8). Contains no abrasive for long life Will not rust or deteriorate Bulk density 100lb/cf. Generates burnished surfa...