Ok so here is my question. I understand that Vials come in various sizes from 5ml-20ml or larger with 10 ml being most common. Also understand or believe that Amps. come as 1ml. but how do you use the amps are they better or worse to use or just different? do you have to break the top off the glass amp. if so how do you draw them up is there advantage to them? Any other info about them and their use that would or could be helpful. thanks in advance for the education.