This the H.S. code for alumina ball products export.

69.03: Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths and rods), other than those of siliceous fossil meals or of similar siliceous earths.

6903.2000 — Containing by weight more than 50% of alumina (Al₂O₃) or of a mixture or compound of alumina and of silica (SiO₂).

69.09: Ceramic wares for laboratory, chemical or other technical uses; ceramic troughs, tubs and similar receptacles of a kind used in agriculture; ceramic pots, jars and similar articles of a kind used for the conveyance or packing of goods.

6909.1200 — Articles having a hardness equivalent to 9 or more on the Mohs scale.