Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Are these screw on tops?
Document: These are great! I keep different types of pasta in them and they are the perfect size. Now I just wish I had another tall one for more pasta. They are a good quality glass and have screw tops so I know they are sealed, and look great. I am very happy with the quality of these canisters.
These are nice. The molded threads are not the greatest so it can be difficult to screw and unscrew the lids. The price was right for a set of glass canisters though.
The lids for these jars appear to be notably flimsier than sets I have bought elsewhere. They form a tight seal, but it is not airtight. Since the lids are so thin and flimsy, I can can screw them on tight. This deforms the lids a bit and they become tough to unscrew. The gaskets are plastic and not rubber, as someone else has noted in another review.
I absolutely liked these containers they do keep everything very fresh definitely coffee. There is no smoggy appearance in the glass. One thing I don't really mind I think it gives them character but you can see the seams where they either sealed the glass or put two pieces together not sure. An the tops feel like they are very flimsy made but the seal underneath makes the difference in keeping your products from being exposed to air and getting stale.
purchased as Christmas gift. looks like solid canisters. just like they look on line. great price free shipping what else is there.
You can't beat the price for 4 canisters! These are great for storing all of my pasta. The different sized canisters accommodate different sizes and shapes of pasta.
When we got the set the tallest container was shattered, and I know Amazon would have replaced it, but I really only needed three so it was OK. They look and work great!
We have been fighting a battle with pantry moths. They will invade and ruin grains, anything made from grains like noodles, nuts, spices and a whole host of food stuffs. Purchased this canister set with the plan of using the airtight factor to keep these critters at bay. However, the lid slips away from the silicon lining which indicates that the likelihood of being air tight is unlikely! Too bad really they are an attractive set of storage jars.
This could be an excellent product IF IT DID NOT CONAIN plastic. Expecting 100% steel, got plastic inside the lids.Not good. Plastic is toxic.Plastic deteriorates with time transferring toxic elements to food.
They work and look good for my kitchen easy to clean good sizes thick glass seals tight hope this helps with your choice
Answer: Yes