Below are the available bulk discount rates for each individual item when you purchase a certain amount
If a retailer/vendor does not specify which ABEC rating, it's likely that's it's ABEC-1, or even lower (not rated)! Most helicopter kits come standard with ABEC-1 rated bearings. ABEC-5 bearings are much tighter in tolerance than ABEC-1 bearings, thus providing much higher accuracy, longer life, Better Efficiancy, and more smoothness.
Chart below shows tolerance levels of abec ratings.