If you order this item, a Taylor R-0004-A-24, you will receive a box of twenty-four 3/4 ounce bottles of Taylor R-0004 reagent (i.e., twenty-four of Taylor model number R-0004-A). A note about Taylor's model numbers: In Taylor Technologies' numbering system, R-xxxx is the identifying number for the reagent. The R-xxxx is followed by a suffix that corresponds to size. "-A" = 0.75 oz. "-C" = 2 ounces. "-E" = 16 ounces. "-F" = 32 ounces, and "-G" = 64 ounces. Those suffixes may then be followed by an additional suffix if the product is ordered in a case. For example, -A sized reagents are often also offered by Taylor in 24-packs by adding the suffix "-24" to the number (i.e., R-xxxx-A-24 is a box of twenty-four 3/4 ounce vials of reagent R-xxxx). -C sized reagents are offered in cases of 12, which is denoted as R-xxxx-C-12 in Taylor's product list.