Huanyu 90mm High Borosilicate Glass Petri Dishes Bacterial Culture Dishes, a Pack of 5PCS

Well packed for shipping, good quality, great price.

Used for looking at Veda Austin’s ideas on water structure

As other reviewers pointed out, the difference in size between the two pieces of the dish is probably bigger than you're used to--the smaller half can slide around a bit when the the petri dish is closed. It's really not a big deal and doesn't affect sterility since you should be incubating or storing them with the medium on top ("upside down") once it's set anyway. Because the bigger dish also has a lip that is longer than the entire height of the lower dish, they can be slightly tricky to pick up when you're pouring (but again, most of the time it won't matter because once it's "upside down," you just grab the bigger dish anyway).I have had them a few weeks and have broken two big halves by accidentally dropping them onto the floor a few feet (the smaller halves survived, maybe because they had the agar in them to absorb some of the energy). So they can be a little delicate, but overall it would probably be a waste to make a thicker petri dish. I have dry-heat sterilized these several times at 170 C for 1 hour with no problems at all.Overall, these pay for themselves over plastic petri dishes once you get about 5 uses out of them and other borosilicate petri dishes are a lot more expensive, so this is probably your best bet if you're a cheapskate like me. :)

This is the 2nd time I order these petri dishes. Since they are made of glass, there is a chance that one of them breaks during shipping but I never had a single one break. They are well package and of very good quality.

These Petri dishes are a very, very good value. They are also packed extremely well. Its impressive when you consider they are shipped directly from China to the US and worldwide. They are made of quality borosilicate glass and when you consider the tumble and shake of the rigorous Amazon fulfillment/logistics process and surviving without some sort of breakage, it's a testament to this merchant's attention to detail and care.So on that point, you need not worry.The quality and the clarity of the glass is extraordinarily good....a cut above other vendors, including Corning. Also, the price point for 5 sets (dishes & covers) beats the competition hands downIndeed, the most important thing about buying from Huanyu is the merchant, who is totally committed to product quality and customer satisfaction. I had a few questions about the dishes and my email was responded to quickly, within just a few hours.You cant make a better choice than Huanyu. I will certainly be patronizing this merchant again. Highly recommended!