Top Quality. Using these jars, I have never had a problem with contamination. I got tired of making my own and the success rate was barely over 50%. Also, it is the best price I have seen- --injection ports and filters are not necessary. To me, is is a good value. I would say

Always get good jars from here

Great price and shipped in timely matter!

Injected the spores in to this lovely cake. 8 weeks later, had a delightful adventure viewing the mushrooms closely.

I ordered 6 Jars and I saw Postal guy throw the box on my front door. I opened the box and one jar was broken. The others look ok, but not sure if they are still good. I called the 800# and spoke to Jennifer and she sent me out replacement jar, so all good. You guys should put Fragile stickers or something on the box. anyways, thanks again!