Tell you what I don't think I'm to fond of 20 gauge for drawing !! Yes I been using them for 3 years ,but I just had to throw 1/4 of a bottle of teen away :(( and I'm not happy about it ,which means I must order agion !! 20 g bros tears up a stopper ,I seen a chunk in there ,at first I was like wtf ,,is this bad filtering etc then I realize its the stopper ,,so I carefully drew my shot to avoid and ended up with 2 ,pieces ,,any more I'm drawing with a 25 ,so what it takes longer ,but won't destroy ,the top,,,which makes me wonder how many bros get infection ??? Even after practicing safe ,and steril drawing ,,lots ,,myself I'm over kill I wash my hands ,then put alcohol on hands , then I clean site like 4 or 5 times with alcohol then bottle tops and sides ,, so I know if I get something ,the god dam drs office isn't half as safe as me ,,how many bros get infects from stoppers ,probley a lot more than we know ,,and makes good since ,,practice safe then infect ,bang