The Jack Grip by Doc Johnson is a single handed, manual stroker, intended to be ergonomic to handle with slippery hands, while providing stimulation to your shaft. It does this, mostly. The ergonomic ridges to enable to grip the stroker easily with a slippery lubed up hand, but the stimulation is a little lacking. I also have the Stroker XL, which I love and use often. Compared to that, the Jack Grip's stimulating texture is what I would consider more natural, but less stimulating.

The Jack Grip is a very soft, jelly like material, called UR3 "ultra realistic". Definitely more jelly like, and realistic, than the Stroker XL (the best toy I Can compare it with). I smell is a little overpowering. Though it's not bad, and my wife actually said "it smells good", its a flowery, baby, rubber smell to me. It was a put off when i opened the package, and a distraction while masturbating.

The jelly like material also makes it very very squishy. This allow you to apply different amounts of pressure to your cock easily. On the downside, it does feel like your having sex with jello.

The texture on the inside is ok. It's like flat little bumps. Compared to the Stroker XL I do consider this a more natural feeling texture, though less stimulating.

The tube actually appears to have different size holes on either end, though they are very similar and you can't tell the difference when entering either end. The fit is also ok, i like that it is a little tighter than the Stroker XL, though the material is so soft, is stretches easier, making it feel less tight. I am an average guy i guess, maybe a little on the long side. The Jack Grip is about 4 inches long, enough to grip it will with one hand, though your penis will probably exit the other end quite a bit when fully "stroked", but I think that is in the design intent. Overall, average size guys will fit fine in this toy, without worry of it splitting or being too lose.

This toy is pretty small, able to fit into a drawer or hidden inside a sock. I would not travel with it, but only due to it's smell. It is smaller than the Stroker XL though.

I understand the "grip" ergonomic feature of this toy, but, I did experiment holding it different ways. The entire "body" of the toy in not circular, but ovular, with more material where the grip is, and on the other side. Get what I'm saying? I think the picture demonstrates this well. So, I played around with holding it sideways, contrary to what the ergonomics "tell" you to do, and I actually liked it more.

The packaging also mentions talcum powder, but it also mentions a suction cup. I think it was inside there on accident.

A mild soap will clean this toy well. Avoid harsh detergents. I would also store it in a cool dry place, away from sunlight and not touching sharp objects. I am not completely sure on lubes at the moment, so I would recommend water based for now. I'll update as soon as I can find more info.