best made tunnel i have run across. i can see the cats through them, and they can see through them as well, but they are made to appear to be opaque, so the cats get a sense of invisibility and steath. the description says they made them that way on purpose. the cats love these tunnels. i don't know how long the price will stay this way, but this is a fantastic deal at $19. it is more like a $40 tunnel. the regular price says something like $43, and i believe it. this may be a sale or introductory price. i've purchased several other large tunnels too, and this tunnel is a foot longer than they are! i could not be more impressed and happy. the cats go nuts in their tunnels, never get tired of them. they jump over them, rest in them, observe deaert activity from inside of them, streak through them alone, chase each each other through them. i have toys securely hanging inside of them (not these but the smaller, wide mesh tunnels), especially small toys they might want to try to swallow. right now there are 12 tunnels altogether on the patio (their Cat-Cave), and about five in the house. i can truly say these are the best of the bunch. since the cars love tunnels but they can clutter up the play space, a couple of weeks ago i decided to line all available patio wall-space with tunnels, to keep the play space as open as possible. toward that end, i got two of these tunnels and set them in the corner of the patio. i then realized that by connecting a third tunnel, i could bypass the litter box area to keep little toys and the cats themselves from flying into the litter box when they are playing. [once, they knocked a whole vacuum into the litter box, and another time a trash can! i shudder to think how many other things have ended up in the litter box.] to that end, the third tunnel is attached using the velcro straps already on the tunnel, and you can see from the pictures that it is separating the play space from their poop space. if they knew my intentions, they might not like being manipulated this way, lol! :) all i need now is another longer small tunnel, already ordered, to put into the end of that third big tunnel running katy-corner to extend all the way to the patio door. it is super easy to move the angled tunnels out of the way to sweep and clean the litter area, and the litter is getting scattered around less now, although, i have found one lone, tiny spiral toy in the area behind the tunnel since making the barrier.