ISO 9001:2000 activated alumina ball White sphere, odorless, tasteless,non-toxic, insoluble in water ... ≤7≤0.75≥280≥0.40≥1605-7mmISO 9001:2000 activated alumina ballWhite sphere, odorless, tasteless,non-toxic,insoluble in water and ... ,regular in particle size,smooth at surface , ISO 9001:2000 activated alumina ball