SP Tropin 10iu 1 x 10 IU 3.3mg

this is a very small dosage. need to purchase multiple

I hate the design of the rubber stopper. It's so thick that its actually hard to get the needle into it. And you always end up with a few i.U.'s of liquid stuck in the vial. It's a good product, and low cost, but I can't understand why they'd use such a horrible vial design.