These are great and I would recommend them to others (and have). The 'only' problem is finding the right tool to perform the job. I would recommend at least four tire tools yet would suggest to go with six and watch the videos provided by the seller or on y-tube. You still save in the long run. The tools I used were plastic and I wore them out, yet I got the tires on the right way so I am totally happy with the tubes. I was happy the tubes fit my rims perfectly. The right tools can be found with some searching on the web or from a bike store. Most tools are for tire 'removal,' which is what made finding the right tools difficult. The best idea I know of is to get three pairs of these: Mighty Extra-Long Tire Levers, Pair and throw them out once done with the job. It may cost, yet, in the end, you will be satisfied with the results. :)

Seem pretty nice so far.. Ride like air! ( Oh, that black ring doesn't come with them )

while providing relief from puncture this product does so at the cost of being a proper tire. comparing this product to the endurance of "Bell" brand never flat tire I can honestly say that the Bell product (on my other bike) is better in every regard. and has lasted thru the same abuse for 2+ years longer (see attached photos; tooks tire apart bell tube covered by 26x1.75, I had bee riding around with around 5 nails in the tire (i never even noticed they were in there till i took tire apart)
When I first purchased this product, It did not fit the tire size advertised. I had to use a 26x 1.95 over "Stop-A-Flat"'s 26 x 2.125. Given the nature of these tires, they put an unusual amount of wear on any rim during installation, both Bell and Stop-a-Flat. however, these tires are supposed to be permanent solutions for as long as the tread on one's tire lasts. Since buying this product and needing to put a smaller than advertised tire over it to gain any function of it, It has now become unusable(4-5months). the shape of this product is not correct. it allows for the pinching of the sidewall in a way that both damages the tire and does not provide rim-tire traction. Say, preventing rear brakes from functioning effectively by allowing the tire to spin over the rim.

After I go to use my bike after it has been parked all night, there is a bump while riding every revolution, as if resting on its kickstand cause the foam tire to form a flat spot.

Often while riding and needing to bank a turn or really anything, the tire still feels like riding on a half flat tire. upon inspecting my 26 x 1.95 tire's sidewall, it has become damaged to where if were to keep using this product, one day while riding, this stop-a-flat would tear through and separate from the rim while banking or something. definitely not a confidence booster on the road. besides look in this picture how easily it pushes to the side. often when riding of the slightlyest uneven terrain my Stop-a-flat is floppin around on my tire.

do not like.

Save yourself the trouble and install a Bell no flat from the beginning

Edit: Edit: upon removing the tire to switch back to air while I wait for my Bell in the mail, I took some pictures of what happened to this tube. keep in mind the 2.125 tire i bought to use over this was way too loose so I put a much tighter 1.95 over it instead. after 6 months of sub-satisfactory use this: (picture) is what happened to it. see for yourself.

the only possibility of using this product would have been MAYBE to try putting a 1.75 tire over the 2.125 tube. from the beginning, mine is destroyed

TLDR: bell is tough as nails. Stop-a-flat works by being already always flat

(to be fair i never tried to fit a 26x1.75 tire over the stop-a-flat. how i got it over the bell tire.... idfk)

So glad we bought these! We live in goat bur territory (evil thorns if you haven't heard of them) and we were so tired of replacing the inner tubes on our jogging stroller (even self sealing ones didn't work). These fit our rims perfectly and are nice and firm. It took two of us to get all three on but they each only took about 5-10 minutes. So far they have worked great and I look forward to never needing to replace another inner tube.

I've had problems many times with tire tubes going bad in the middle on a long ride with me having to walk the bike back home some distance. I was interested in getting airless tire tubes and after much research decided on this one. I took the time to read the reviews as I didn't want to waste my time and money on an inferior product. I'm glad I did. I saw where a few customers had recommended using the next size larger tire width as it fits better within the tire. I thought I would take a chance and did just that. I have a 26" x 1.95" tire so I ordered the 26" x 2.125" tube. The reviewers said that it was a bit difficult to mount which I found out to be true, but not overly so. It just took a bit of patience and strength. Once mounted on the rear wheel I took the bike for a test run and found that it rode perfectly. And what is even better, no possibility of anymore flats. I just reordered the same size to put on my front wheel and I'm sure it will work as well also. Thank you to the people who left reviews with good advice.