Both Prima Shot and BMV/Vacc handles are made of the same material PP, 30% Glass. Last time we sent you 50ml Prima Shots in a whole set and the batch number were laser printed. We are not quite sure your problem either the pad print will come off or you can't pad print batch number on handles. Please give us some time to ask vendor whether they also had ever have this problem and the solution. In addition, there are another 2 containers shipment of REAR HANDLE BMV VACC and FRONT HANDLE BMV VACCINATOR using the same specification of material.